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impromptuadjective made or done without previous thought or preparationour dinner guest thanked us with an impromptu song ad hoc, ad-lib, down and dirty, extemporaneous, extemporary, extempore, improvisational, improvised, off-the-cuff, offhand, offhanded, snap, spur-of-the-moment, unconsidered, unplanned, unpremeditated, unprepared, unrehearsed, unstudied unscriptedautomatic, impulsive, instinctive, involuntary, spontaneouscasual, cursive, informal, unauthorizedhalf-baked, half-cocked, ill-advised considered, planned, premeditated, premeditative, prepared, rehearsed deliberate, intended, intentional something that is performed, made, or done without preparationalthough five different lines had been written, the best choice turned out to be an impromptu from the tired actor himself ad-lib, extemporization, improv, improvisation concoction, contrivance, creation, innovation, invention, wrinkle bit, drill, routine in 1683 |