Pronunciation: (tOO),[key] —adv. 1. in addition; also; furthermore; moreover: young, clever, and rich too. 2. to an excessive extent or degree; beyond what is desirable, fitting, or right: too sick to travel. 3. more, as specified, than should be: too near the fire. 4. (used as an affirmative to contradict a negative statement): I am too! 5. extremely; very: She wasn't too pleased with his behavior. 6. only too. See only (def. 5).