spontaneous

Universal Words adjective 1 not planned but done because you suddenly want to do it: a spontaneous offer of help * The audience burst into spontaneous applause. 2 (of a person) often doing things without planning to, because they suddenly want to do them 3 (technical) happening naturally, without being made to happen: spontaneous remission of the disease * a spontaneous abortion (= a MISCARRIAGE) 4 done naturally, without being forced or practised: a tape recording of spontaneous speech * a wonderfully spontaneous performance of the piece spontaneously adverb: We spontaneously started to dance. * The bleeding often stops spontaneously.