unbidden Synonyms

off top of head unplanned uninvited unwelcome undesirable unforced unrehearsed off-the-cuff uncompelled unconstrained willful unasked uncalled not asked unwished-for unwished unwanted unsolicited unrequested unprompted unsought undesired undemanded willing volunteer gratuitous free feeling extempore extemporaneous elective discretional casual autonomous automatic impetuous impromptu voluntary unstudied uncalled-for unbid supererogatory spontaneous optional offhand instinctive impulsive accommodating