extemporise
(ex-tem-po-rise)
4 syllables
Definition
verb. 1 to speak without preparation or reference to notes; 2.in music to compose as one performs; improvise. Chiefly British.
Example Sentence
He can extemporise on any of a number of subjects.
Synonyms
ad-lib; play it by ear; off the cuff
Antonyms
prepared; planned