—adj. 1. of unsound physical or mental health; unwell; sick: She felt ill, so her teacher sent her to the nurse. 2. objectionable; unsatisfactory; poor; faulty: ill manners. 3. hostile; unkindly: ill feeling. 4. evil; wicked; bad: of ill repute. 5. unfavorable; adverse: ill fortune. 6. of inferior worth or ability; unskillful; inexpert: an ill example of scholarship. 7. ill at ease, socially uncomfortable; nervous: They were ill at ease because they didn't speak the language.
—n. 1. an unfavorable opinion or statement: I can speak no ill of her. 2. harm or injury: His remarks did much ill. 3. trouble, distress, or misfortune: Many ills befell him. 4. evil: to know the difference between good and ill. 5. sickness or disease.
—adv. 1. in an ill manner.
2. unsatisfactorily; poorly: It ill befits a man to betray old friends. 3. in a hostile or unfriendly manner.
4. unfavorably; unfortunately.
5. with displeasure or offense.
6. faultily; improperly.
7. with difficulty or inconvenience; scarcely: Buying a new car is an expense we can ill afford.