spontaneous Synonyms

voluntary self-generated unplanned unpremeditated instinctive unforced natural uncompelled involuntary off-the-cuff unrehearsed casual impulsive unwritten unprompted unwitting unwilled unthinking unstudied throwaway ad hoc uninhibited ad lib unlearned volitional unconstrained visceral volunteer willed willing xenogenesis untaught spontaneously uncoerced unexpected unalert unannounced unanticipated unasked uncompensated uncontrived unplanted unrequested unsolicited unscripted unselfconscious subliminal on the spot off-hand automated