All 3 Uses

coherent
in
Me and Earl and the Dying Girl
(Auto-generated)

I was lurching through the streets of Earl's not-so-great part of Homewood, moving my lips, making semi-coherent noises, walking faster than is graceful for an overweight person to walk, and emitting maybe a quart of human sweat.†
p. 247.1

coherent = sensible and clear; or describing parts as fitting together in a consistent or pleasing manner
In fact, directors Gaines and Jackson begin the film with a grainy, pixilated apology to Rachel herself, admitting that the film is badly organized and basically incoherent.†
p. 259.5 *

incoherent = not sensible or clear; or describing parts as not fitting together in a consistent or pleasing manner

standard prefix: The prefix "in-" in incoherent means not and reverses the meaning of coherent. This is the same pattern you see in words like invisible, incomplete, and insecure.
We had to step out into the hall eventually, but not before Mom had a bizarre interaction with Denise, where she hugged Denise's body and said some incoherent things while Denise just sat there rigidly.†
p. 279.6

Definitions:

(1) (coherent)
sensible and clear; or describing parts as fitting together in a consistent or pleasing manner
(2) (meaning too rare to warrant focus)
A comprehensive dictionary will have more specialized definitions of coherent such as one used in physics.