Reacting immediately and sharply:
(Now Rare) Appearing in good time; early
Not slow or hesitating; quick in action or perception of any kind; dexterous; prompt; easy; expert.
Occurring at an advanced hour, especially well into the evening or night:
Find another word for promptest. In this page you can discover 6 synonyms, antonyms, idiomatic expressions, and related words for promptest, like: quickest, timeliest, readiest, slowest, latest and tardiest.