IMPROMPTU
ADJECTIVES
► LARGE of speech, etc.: free, unrestrained; in bad sense, lax, licentious, improper, gross → c1374 obs.
► OFF THE ARM impromptu, ‘off the cuff’; hence, at a price informally agreed upon → 1942 US sl.
► OFF-THE-CUFF with little or no preparation; extemporaneous; impromptu → 1940
► SUDDEN done, performed, or prepared on the spur of the moment; extempore, impromptu → 1591 obs.
VERBS
► RAP to have any form of impromptu dialogue → 1960s sl.
Lexicophilia 