ill
noun
an often persistent bodily disorder or disease; a cause for complaining
adjective
affected by an impairment of normal physical or mental function
“ill from the monotony of his suffering”
SynonymssickOppositeswellresulting in suffering or adversity
“ill effects”
“it's an ill wind that blows no good”
distressing
“ill manners”
“of ill repute”
indicating hostility or enmity
“you certainly did me an ill turn”
“ill feelings”
presaging ill fortune
“ill omens”
“ill predictions”
adverb
(`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”
Oppositeswellunfavorably or with disapproval
“tried not to speak ill of the dead”
“thought badly of him for his lack of concern”
SynonymsbadlyOppositeswellwith difficulty or inconvenience; scarcely or hardly
“we can ill afford to buy a new car just now”
Source: WordNet 3.1, Princeton University
