Ail

Part of speech: noun (n.)

Indisposition or morbid affection. Pope.

Part of speech: verb (v.)

To affect with pain or uneasiness, either physical or mental; to trouble; to be the matter with; -- used to express some uneasiness or affection, whose cause is unknown; as, what ails the man I know not what ails him. What aileth thee, Hagar Gen. xxi. 17.

Part of speech: verb (v.)

To be affected with pain or uneasiness of any sort; to be ill or indisposed or in trouble. When he ails ever so little . . . he is so peevish. Richardson.