What are the best answers for “of or pertaining to improvisation or extemporaneous composition.”?

improvisatorial, improvisatory.

How many letters does the top answer for “of or pertaining to improvisation or extemporaneous composition.” have?

The most common answer is improvisatorial (15 letters).

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

improvisatorial 15 letters web-def

Of or pertaining to improvisation or extemporaneous composition.

improvisatory 13 letters web-def

Of or pertaining to improvisation or extemporaneous composition.