Etymology
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guilty (adj.)
Old English gyltig "offending, delinquent, criminal," from gylt (see guilt (n.)). In law, "that has committed some specified offense," late 13c. Of conscience, feelings, etc., 1590s. Meaning "person who is guilty" is from 1540s. To plead not guilty is from 15c.; to plead guilty is 19c., though, as OED notes, "Guilty is technically not a plea, but a confession." Related: Guiltily; guiltiness.
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bigamous (adj.)
"pertaining to or guilty of bigamy," 1690s; see bigamy + -ous.
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served (adj.)
"found guilty, convicted; ordered to be punished or transported; beaten," 1811, slang past-participle adjective from serve (v.).
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blood-stained (adj.)
"stained with blood; guilty of slaughter," 1590s, from blood (n.) + past participle of stain (v.).
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convict (n.)

late 15c., "person proved or found guilty of an alleged offence," from obsolete adjective convict "convicted," from Latin convictus (see convict (v.)). Slang shortening con is from 1893.

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traitorous (adj.)
late 14c., "guilty of treason," apparently from Old French traitros "treacherous" (13c.), from traitor (see traitor). Related: Traitorously; traitorousness.
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felo-de-se (n.)
in old law use, "one who commits the felony of suicide," whether deliberately or in maliciously attempting to kill another, Latin, literally "one guilty concerning himself." See felon.
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murderous (adj.)

1530s, "guilty of murder;" 1590s, "pertaining to or involved in murder," a hybrid from murder + -ous. An Old English word for it was morðorhycgende. Related: Murderously; murderousness.

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