Definition of sick :
1. Affected with disease of any kind; ill; indisposed; not in health. See the Synonym under Illness.
2. Affected with, or attended by, nausea; inclined to vomit; as, sick at the stomach; a sick headache.
3. Corrupted; imperfect; impaired; weakned.
4. Having a strong dislike; disgusted; surfeited; - with of; as, to be sick of flattery.
6. To fall sick; to sicken.
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diseased (part of speech: adjective)