All 9 Uses of

rogue

in

King Lear

A knave; a rascal; an eater of broken meats; a base, proud, shallow, beggarly, three-suited, hundred-pound, filthy, worsted-stocking knave; a lily-livered, action-taking, whoreson, glass-gazing, superserviceable, finical rogue; one-trunk-inheriting slave; one that wouldst be a bawd in way of good service, and art nothing but the composition of a knave, beggar, coward, pander, and the son and heir of a mongrel bitch: one whom I will beat into clamorous whining, if thou denyest the least syllable of thy addition.†
Scene 2.2

Draw, you rogue: for, though it be night, yet the moon shines; I'll make a sop o' the moonshine of you: draw, you whoreson cullionly barbermonger, draw!†
Scene 2.2 *

Draw, you rascal: you come with letters against the king; and take vanity the puppet's part against the royalty of her father: draw, you rogue, or I'll so carbonado your shanks:— draw, you rascal; come your ways!†
Scene 2.2

Such smiling rogues as these, Like rats, oft bite the holy cords a-twain Which are too intrinse t' unloose; smooth every passion That in the natures of their lords rebel; Bring oil to fire, snow to their colder moods; Renege, affirm, and turn their halcyon beaks With every gale and vary of their masters, Knowing naught, like dogs, but following.†
Scene 2.2

Let's follow the old earl, and get the Bedlam To lead him where he would: his roguish madness Allows itself to anything.†
Scene 3.7

roguish = having the characteristics of a "rogue" (not behaving like others; often dangerous)

Mine enemy's dog, Though he had bit me, should have stood that night Against my fire; and wast thou fain, poor father, To hovel thee with swine and rogues forlorn, In short and musty straw?†
Scene 4.7

Come, let's away to prison: We two alone will sing like birds i' the cage: When thou dost ask me blessing I'll kneel down And ask of thee forgiveness: so we'll live, And pray, and sing, and tell old tales, and laugh At gilded butterflies, and hear poor rogues Talk of court news; and we'll talk with them too,— Who loses and who wins; who's in, who's out;— And take upon's the mystery of things, As if we were God's spies: and we'll wear out, In a wall'd prison, packs and sects of great ones That ebb and flow by the moon.†
Scene 5.2

Definition:

not normal and possibly dangerous -- possibly alone

The exact meaning of rogue can depend upon its context. For example:

"a rogue state" -- (politics) a dangerous country that ignores international conventions
"a rogue animal" -- (especially of an elephant) dangerous and not living with or like its kind
"a rogue trader" -- (finance) an employee who makes unauthorized and improper securities trades
"a rogue wave" -- (oceanography) a dangerous wave that is much larger than others around it
"rogue cells" -- (biology) tumor cells
"He is a rouge." -- someone who is deceitful and unprincipled (though possibly liked despite that)
"a roguish grin" -- mischievous (causing minor trouble in a playful, harmless way)