spontaneous Synonyms

voluntary uncompelled unwritten self-generated willed willing xenogenesis uncoerced unconstrained throwaway ad hoc volunteer unconscious unconsidered unlearned unstudied unthinking unwilled unwitting visceral volitional ad lib off-the-cuff unrehearsed off-hand unplanned unannounced unasked unplanted unprompted unrepressed unsolicited instinctual unpremeditated unprepared automated knee jerk free-and-easy noncausal unorganised unforced uninhibited unintentional unselfconscious ad libitum extempore free gratuitous impetuous impromptu