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as in:  can’t function well without sleep

I don’t function well on less than six hours of sleep a night; and I do best on nine.
  work or operate — sometimes to work or operate normally or in a particular way
 Mark word for later review on this computer
function functions functioned functioning functional
Function has many reasonably common, but highly diverse senses. Accordingly, it is generally recommended that you just learn the sense (or senses) that currently interest you.
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  • I don’t function well on less than six hours of sleep a night; and I do best on nine.
  • My brain does not function as well when I’m under stress.
  • Moderate exercise improves brain function.
  • The computer isn’t functioning properly.

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  • The computer isn’t functional.
  • If the hurricane is bad, the school gym will function as an emergency shelter.
  • The kitchen table also functions as a study desk.
  • And of course our community can’t function smoothly if people don’t use precise language.
    Lois Lowry  --  The Giver
  • I was just Travis 2.0—all the same files in a brand-new, fully functioning operating system.
    John Corey Whaley  --  Nogin
  • Standing before this abraded pile, the eye regarded its present usage, the mind dwelt upon its past history, with a satisfied sense of functional continuity throughout—a feeling almost of gratitude, and quite of pride, at the permanence of the idea which had heaped it up.
    Thomas Hardy  --  Far from the Madding Crowd

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  • He never met a classmate in the hall of Main Medical without shouting, "How’s your vermiform appendix functioning this morning?" or "I bid thee a lofty greeting, old pediculosis."
    Sinclair Lewis  --  Arrowsmith
  • The architecture of the Overlords was bleakly functional: Jan saw no ornaments, nothing that did not serve a purpose, even though that purpose was often beyond his understanding.
    Arthur C. Clarke  --  Childhood’s End
  • From the very beginning of his illness, ever since he had first been to see the doctor, Ivan Ilych’s life had been divided between two contrary and alternating moods: now it was despair and the expectation of this uncomprehended and terrible death, and now hope and an intently interested observation of the functioning of his organs.
    Leo Tolstoy  --  The Death of Ivan Ilych
  • Hawat’s shocked fury had mounted until it threatened the smooth functioning of his Mentat capabilities.
    Frank Herbert  --  Dune
  • I had imagined that the condition of the cars, whether or not things were obtainable, the smooth functioning of the business of removing wounded and sick from the dressing stations, hauling them back from the mountains to theclearing station and then distributing them to the hospitals named on their papers, depended to a considerable extent on myself.
    Ernest Hemingway  --  A Farewell to Arms
  • It was smaller than the Kidwell’s, and, moreover, he shared it with a wife, three active children, and a perpetually functioning television set.
    Truman Capote  --  In Cold Blood
  • The small black hole gaped where their varied forms and colours had momentarily functioned.
    E.M. Forster  --  A Passage to India
  • It turned out to be a functional pa le brick building, one story, with slab floors and bright lighting.
    Don DeLillo  --  White Noise
  • It seemed as if what the old king had called "beginner’s luck" were no longer functioning.
    Paulo Coelho  --  The Alchemist
  • His mind, temporarily sidetracked, oiled itself and ticked and turned and woke up, functioning.
    Michael Shaara  --  The Killer Angels
  • The way driving schools prepared functional illiterates for the written part of the driver’s exam.
    Stephen King  --  Cujo
  • Specifics may come to you, certain repressed conduits electrically prodded into functioning.
    Robert Ludlum  --  The Bourne Identity
  • Her hair was cut short like a man’s, and she wore the kind of functional dark tunic favored by Soviet wives.
    John Le Carre  --  The Spy Who Came In From The Cold
  • When an animal laments, it is not a lament; it is merely the rasp of a poorly functioning mechanism.
    Milan Kundera  --  The Unbearable Lightness of Being
  • I don’t know how much outer zoology they are teaching you kids these days-from the ignoramuses we get for recruits I’ve reached the conclusion that this new-fangled ’functional education’ has abolished studying in favor of developing their cute little personalities.
    Robert A. Heinlein  --  Tunnel In the Sky
  • We knew what the brain caste looked like; we had seen them dead (in photographs) and we knew they could not run — barely functional legs, bloated bodies that were mostly nervous system.
    Robert A. Heinlein  --  Starship Troopers
  • He loses what was destroyed but goes on functioning.
    Robert A. Heinlein  --  The Moon is a Harsh Mistress
  • They-we-sent back more functional intelligence than all the units sent out by Saigon put together.
    Robert Ludlum  --  The Bourne Ultimatum
  • It functioned for less than five minutes, and then turned itself off again.
    Roger Zelazny  --  Lord of Light
  • It seems to be functioning all right now.
    Roger Zelazny  --  My Name is Legion
  • Usually I appreciated the lack of word-spew, which would begin when she was fully functioning, but right now we needed to move, move, move! I practically threw Nudge through the window, slithered out myself, then propped the screen back in place as best I could.
    James Patterson  --  The Angel Experiment
  • Functional enough, I suppose.
    Ted Dekker  --  Black: The Birth of Evil
  • He’d fashioned the spyglass from his memory of the histories, using a resin from the pine trees, and although it hardly functioned as he suspected it should, it did give him a slight advantage over the naked eye.
    Ted Dekker  --  Red: The Heroic Rescue
  • She looked nice, but her face had that hollow look it had taken on since Cass left, like she was just a shell of her former self, functioning and talking but hardly alive.
    Sarah Dessen  --  Dreamland
  • Melissa was a lot more functional here in the blue time, but Rex still hovered.
    Scott Westerfeld  --  The Secret Hour
  • He didn’t really know popular music, and his clothes were, well, functional.
    D.J. Machale  --  The Merchant of Death
  • She stepped in close to watch how he did it and for the first time she was aware of the smell of him, a warm clean smell of leather and some functional brand of soap.
    Nicholas Evans  --  The Horse Whisperer
  • Sometimes, Mary and I functioned as a caretaking unit.
    Alice Sebold  --  Lucky
  • The lake and campground they were headed for was only a few miles beyond Joseph, and after finding their site they all pitched in and had everything set up in short order—perhaps not exactly the way Nan would have preferred, but functional nonetheless.
    William P. Young  --  The Shack
  • I have a basic functional knowledge of several languages, but know almost nothing of the rest of them.
    James A. Owen  --  Here, There be Dragons
  • But even with a fully functioning transmitter, I don’t think we’d be able to send a signal very far from down here."
    Kenneth Oppel  --  Airborn
  • The hate and fear which we have inspired in him, woven by our civilization into the very structure of his consciousness, into his blood and bones, into the hourly functioning of his personality, have become the justification of his existence.
    Richard Wright  --  Native Son
  • Impossibly, the water in the bathroom was still functioning.
    Dave Eggers  --  Zeitoun
  • It was clear that her orderly mind was functioning no less professionally than at the Baskul mission house.
    James Hilton  --  Lost Horizon
  • Spyglasses functioned with feverish energy.
    Jules Verne  --  Twenty Thousand Leagues Under the Sea
  • Exactly how her marriage with Greger Beckman functioned, he had no idea.
    Stieg Larsson  --  The Girl Who Played with Fire
  • It was an indication that Niedermann was functioning, and a functioning Niedermann was invincible.
    Stieg Larsson  --  The Girl Who Kicked the Hornet’s Nest
  • Decrease in intellectual functioning for a day or two.
    James Patterson  --  Kiss the Girls
  • After so many torturous days of cheap, functional food, this is like going to heaven.
    Sophie Kinsella  --  Confessoins of a Shopaholic
  • His feet were completely dead now, his knees worked like old hinges, his kidneys functioned when they would, but his heart persisted doggedly to beat.
    Flannery O’Connor  --  A Good Man is Hard to Find AND OTHER STORIES
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Associated words [difficulty]:   function [1]
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