Ail

1. n. Indisposition or morbid affection.
2. v. t. 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.
3. v. i. To be affected with pain or uneasiness of any sort; to be ill or indisposed or in trouble.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.