Synonym: ailing, bad, below par, evil, indisposed, out of sorts, rocky, sick, unwell, wrong. Antonym: good, healthy, well. Similar words: will, kill, pill, bill, silly, spill, drill, chill. Meaning: [ɪl] 
n. an often persistent bodily disorder or disease; a cause for complaining. adj. 1. affected by an impairment of normal physical or mental function 2. resulting in suffering or adversity 3. distressing 4. indicating hostility or enmity 5. presaging ill fortune. adv. 1. (`ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well 2. unfavorably or with disapproval 3. with difficulty or inconvenience; scarcely or hardly.
n. an often persistent bodily disorder or disease; a cause for complaining. adj. 1. affected by an impairment of normal physical or mental function 2. resulting in suffering or adversity 3. distressing 4. indicating hostility or enmity 5. presaging ill fortune. adv. 1. (`ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well 2. unfavorably or with disapproval 3. with difficulty or inconvenience; scarcely or hardly. 
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181, Joe's been ill for weeks now - it's really dragging him down.
182, We'll have to find someone to fill in for Francis tonight as he's ill.
183, He wasn't ill, Sophie decided. He was just plain scared.
184, The patient is holding her own although she is still very ill.
185, Mr Baker is ill today, so Miss Dixon is sitting in for him .