ill, a. ailing, [sick], unwell; [evil], [unfavorable], adverse, [bad].
ill at ease. [uneasy], uncomfortable, [anxious].
ill-boding, a. [ominous], inauspicious.
illegal, a. [illicit], [unlawful], [contraband], unlicensed, [illegitimate].
illegality, n. unlawfulness, illegitimacy.
illegitimate, a. [bastard], adulterine; [illegal], [illicit]; [spurious].
illegitimate, v. illegitimatize, [bastardize].
illiberal, a. [ungenerous], parsimonious, [stingy]; [narrow-minded], [bigoted].
illiberality, n. parsimony, [stinginess]; [narrow-mindedness], [bigotry], [intolerance].
illicit, a. prohibited, [unlawful].