hifalutin (adjective) boastful: bragging
Sinonime: ad hoc, ad-lib, automatic, autoschediastic, by ear, casual, expedient, extemporary, extempore, fake*, free, immediate, impromptu, improv, improvisatory, improvised, improviso, informal, jamming, made-up, makeshift, offhand, on impulse, on-the-spot, snap, spontaneous, toss off, toss out, unplanned, unpremeditated, unprepared, unrehearsed, unstudied, winging it
Antonime: deprecating,
modest