improvise
verb
[ ˈɪmprəvʌɪz ]
• create and perform (music, drama, or verse) spontaneously or without preparation.
• "he invited actors to improvise dialogue"
Similar:
extemporize,
ad lib,
speak impromptu,
make it up as one goes along,
think on one's feet,
take it as it comes,
speak off the cuff,
play it by ear,
busk it,
wing it,
impromptu,
improvisational,
improvisatory,
unrehearsed,
unprepared,
unscripted,
extempore,
extemporized,
spontaneous,
unstudied,
unpremeditated,
unarranged,
unplanned,
on the spot,
ad libitum,
off-the-cuff,
spur of the moment,
improvisatorial,
Origin:
early 19th century (earlier (late 18th century) as improvisation ): from French improviser or its source, Italian improvvisare, from improvviso ‘extempore’, from Latin improvisus ‘unforeseen’, based on provisus, past participle of providere ‘make preparation for’.