impromptu Synonyms

ad libitum spontaneously offhand extempore extemporary extemporaneous unrehearsed offhanded off-the-cuff ad lib improvisational on impulse offhandedly off-hand improv extemporaneously unpremeditated unprepared by ear stopgap on the fly on the spot unplanned according to pleasure as one thinks best off the top of head as one wishes without rehearsal without preparation unscripted unsolicited unprompted unposed uncontrived unarranged unannounced spur of the moment rough and ready precipitously ad hoc throwaway improvisatory improvisatorial improvisation horseback headfirst glancingly freewill extemporized extemporization