(1):

(superl.) Affected with, or attended by, nausea; inclined to vomit; as, sick at the stomach; a sick headache.

(2):

(superl.) Affected with disease of any kind; ill; indisposed; not in health. See the Synonym under Illness.

(3):

(superl.) Having a strong dislike; disgusted; surfeited; - with of; as, to be sick of flattery.

(4):

(superl.) Corrupted; imperfect; impaired; weakned.

(5):

(n.) Sickness.

(6):

(v. i.) To fall sick; to sicken.