Off the top of one's head Off the top of one's head antonyms If you know antonyms for Off the top of one's head, then you can share it. Suggest antonym for Off the top of one's head Off the top of one's head synonyms impromptu off the cuff offhand extemporary extempore ad lib just like that at the drop of a hat off-the-cuff spur-of-the-moment on the spur of the moment Full list of synonyms (11)
