Synonyms of improvised

2 Syllables

casual, band-aid, stopgap, ad-hoc, offhand, ad-lib

3 Syllables

spontaneous, unbidden, unstudied, makeshift, adlibbed, ad-libbing, invented, interim, impromptu, fly-by-night, fictitious, hit-or-miss, off-the-cuff

4 Syllables

improviso, unprepared, unrehearsed, extempore, rough-and-ready, wild-and-woolly, thrown-together, quick-and-dirty, jury-rigged

5 Syllables

spur-of-the-moment, unpremediated, extemporized, extemporaneous, autoschediastic, extemporary