Noun

• S: (n) ailment, complaint, ill (an often persistent bodily disorder or disease; a cause for complaining)

Adjective

• S: (adj) ill, sick (affected by an impairment of normal physical or mental function) "ill from the monotony of his suffering"
• S: (adj) ill (resulting in suffering or adversity) "ill effects"; "it's an ill wind that blows no good"
• S: (adj) ill (distressing) "ill manners"; "of ill repute"
• S: (adj) ill (indicating hostility or enmity) "you certainly did me an ill turn"; "ill feelings"; "ill will"
• similar to
• antonym
• S: (adj) ill, inauspicious, ominous (presaging ill fortune) "ill omens"; "ill predictions"; "my words with inauspicious thunderings shook heaven"- P.B.Shelley; "a dead and ominous silence prevailed"; "a by-election at a time highly unpropitious for the Government"

Adverb

• S: (adv) ill, badly, poorly ((`ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well) "he was ill prepared"; "it ill befits a man to betray old friends"; "the car runs badly"; "he performed badly on the exam"; "the team played poorly"; "ill-fitting clothes"; "an ill-conceived plan"
• S: (adv) ill, badly (unfavorably or with disapproval) "tried not to speak ill of the dead"; "thought badly of him for his lack of concern"
• S: (adv) ill (with difficulty or inconvenience; scarcely or hardly) "we can ill afford to buy a new car just now"