"evil-doing, malevolent treatment," early 13c., verbal noun from ill (v.).

"sick, ill, suffering," 1590s, present-participle adjective from ail (v.).

"eternal," 1620s, from time (n.) + -less. Earlier it meant "ill-timed" (1550s). Related: Timelessly; timelessness.

"in a spiteful manner, with enmity or ill-will," late 14c., from malicious + -ly (2).

"ill-tempered," 1846, slang, probably from shirt (n.) + -y (2), on notion of being disheveled in anger.

"offensively ill-bred; characteristic of a cad," 1868, from cad (n.) + -ish. Related: Caddishly; caddishness.

1570s, "ill-omened, inauspicious, unlucky," from stem of Latin sinister (see sinister) + -ous. Related: Sinistrously.

1620s, "feeling of petulant displeasure, fit of ill humor," colloquial, perhaps imitative of an exclamation of disgust (compare German muffen "to sulk").

"in spite of, notwithstanding," mid-14c., from Old French maugre, maulgrec "in spite of" (Modern French malgré), elliptical use of the noun maugre "ill-will, spite," from Latin malus "bad, ill, unpleasant" (see mal-) + gratum "a pleasant thing," noun use of neuter of gratus "pleasing, welcome, agreeable" (from suffixed form of PIE root *gwere- (2) "to favor"). The noun maugre "ill-will" also was in Middle English (c. 1300). For sense, compare in spite of.

"ill-formed, having defects of formation," 1801, from mal- + formed, past participle of form (v.).