Dictionary definition · 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"
- resulting in suffering or adversity"ill effects"
- distressing"ill manners"
- indicating hostility or enmity"you certainly did me an ill turn"
- presaging ill fortune"ill omens"
adverb
- (‘ill’ is often used as a combining form) in a poor or improper or unsatisfactory manner; not well"he was ill prepared"
- unfavorably or with disapproval"tried not to speak ill of the dead"
- with difficulty or inconvenience; scarcely or hardly"we can ill afford to buy a new car just now"
Source: Open English WordNet (CC BY 4.0).