adjective
improvised
Synonyms: ad hoc, ad-lib, automatic, autoschediastic, by ear, casual, expedient, extemporary, extempore, fake, free, immediate, impromptu, improv, improvisatory, improviso, informal, jamming, made-up, makeshift, offhand, on impulse, on-the-spot, snap, spontaneous, spur-of-the-moment, toss off, toss out, unplanned, unpremeditated, unprepared, unrehearsed, unstudied, winging it
Antonyms: deliberate, planned, premeditated, prepared, rehearsed
adjective
unrehearsed, improvised
Synonyms: ad hoc, ad lib, at first glance, automatic, by ear, casual, expedient, extempore, free, immediate, impromptu, improv, improvisatory, improviso, informal, jamming, made-up, makeshift, offhand, off the cuff, off the top of head, on impulse, on-the-spot, snap, spontaneous, spur-of-the-moment, taking for ride, thought out loud, tossed off, tossed out, unplanned, unpremeditated, unprepared, unstudied, winging it
Antonyms: planned, prepared, read, rehearsed, written