Synonyms of extemporise
ad-libIf you ad-lib something in a play or a speech, you say something which has not been planned or written beforehand.
• He is rather disjointed when he ad-libs.
improvisespeak off the cuffvampbuskwing it (informal)extemporizespeak extemporaneouslyspeak impromptu
improviseWhen performers improvise, they invent music or words as they play, sing, or speak.
• Take the story and improvise on it.
ad-libinventvampbuskwing it (informal)play it by ear (informal)extemporizespeak off the cuff (informal)
wing it (informal)
Thesaurus for extemporise from the Collins English Thesaurus