Synonyms of off-the-cuff

1 Syllable
free, snap, fake
2 Syllables
made-up, jamming, invent, casual, improv, ad-hoc, offhand, ad-lib
3 Syllables
on-the-spot, spontaneous, unstudied, unbidden, expedient, makeshift, adlibbed, ad-libbing, inventing, impromptu, unplanned, informal, unfussy, throwaway
4 Syllables
improviso, improvised, unprepared, unrehearsed, immediate, automatic, extempore, low-pressure, free-and-easy, quick-and-dirty, jury-rigged
5 Syllables
spur-of-the-moment, unpremediated, autoschediastic, extemporary
6 Syllables
unpremeditated, improvisatory