unbidden Synonyms

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