Thesaurus

Synonyms for Ill include:

abominable, abusive, afflicted, aggressive, aguish, ailing, air sick, airsick, angry, antagonistic, antipathetic, antipathetical, apractic, apraxic, arthritic, asthmatic, at loggerheads, atrocious, autistic, awful, bad, bandy, bandy-legged, bedfast, bedrid, bedridden, belligerent, bilious, bitter, blebby, blistery, bloated, bloodshot, bowed, bowleg, bowlegged, broken-backed, bronchitic, bruising, calumniatory, calumnious, cankerous, carbuncled, carbuncular, carious, carsick, caseous, catastrophic, chilblained, colicky, consumptive, convalescent, corked, corky, counterproductive, crappy, creaky, crippled, crookback, crookbacked, cytomegalic, damaging, defamatory, dehydrated, deleterious, delirious, denigrating, denigrative, denigratory, deplorable, destructive, detrimental, diabetic, dipped, dirty, disabled, disadvantageous, diseased, disobedient, distended, distressing, dizzy, dreadful, dropsical, dyspeptic, edematous, enlarged, evil, faint, fearful, feverish, feverous, flabby, flaccid, flatulent, foaming, foamy, frail, frightful, frothing, funny, game, gammy, gangrenous, gassy, gibbous, giddy, gimpy, gouty, green, hallucinating, halt, halting, handicapped, hard, harmful, hateful, head-on, hopeless, horrid, hostile, humpbacked, humped, hunchbacked, hurtful, icky, icteric, ill, impaired, inauspicious, incompetent, indisposed, inflamed, inflammatory, ingrowing, ingrown, inimical, injurious, insidious, intumescent, jaundiced, knock-kneed, kyphotic, laid low, laid up, lame, lamentable, libellous, libelous, light, light-headed, lightheaded, liverish, livery, lordotic, lousy, maimed, malign, mediocre, membrane-forming, membranous, mental, milk-sick, mischievous, morbid, mortified, mutilated, naughty, nauseated, nauseous, negative, no-good, nocent, noxious, offensive, ominous, opponent, opposing, painful, palsied, paralytic, paralyzed, paraplegic, pathologic, pathological, peaked, pernicious, pitiful, poor, poorly, prejudicial, prejudicious, pretty, pro-inflammatory, proinflammatory, puffed, puffy, queasy, rachitic, recovering, rheumatic, rheumatoid, rheumy, rickety, rotten, rubber, ruinous, sad, sallow, scrofulous, seasick, seedy, severe, sick, sick-abed, sickish, sickly, slanderous, sneezy, soft, sore-eyed, sorry, spastic, spavined, stabbing, stinking, stinky, stricken, subtle, sunburned, sunburnt, swayback, swaybacked, swingeing, swollen, swooning, terrible, thunderous, tough, toxic, tubercular, tuberculous, tumescent, tumid, turgid, ulcerated, ulcerous, uncool, under the weather, unfavorable, unfavourable, unfit, unfriendly, unhealed, unhealthy, unpeaceful, unpropitious, unskilled, unsound, unspeakable, unsuitable, unwell, unwholesome, upset, varicose, vertiginous, violent, wheezing, wheezy, windburned, windburnt, woozy, worse, worst, wounding, yellow

ill is a ADJ.

badly, ill, poorly

ill is a ADV.

ailment, complaint, ill

ill is a NOUN.