something that is improvised or extemporized.
spontaneous, impromptu, makeshift, ad-lib, extemporaneous, extempore, fly-by-night, hit-or-miss, offhand, unprepared, unrehearsed, unstudied, spur-of-the-moment, Band-Aid, automatic, casual, expedient, fake, free, immediate
Origin of autoschediasm
1835–45; < Greek autoschedíasma, derivative, with -(s)ma resultative noun suffix, of autoschediázein to extemporize, verbal derivative of autoschédios hand-to-hand, offhand, improvised, equivalent to auto- auto-1 + schédios near, casual, offhand, derivative of schedón (adv.) near, close by, akin to échein to hold, possess
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019