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English definition of “spontaneous”

spontaneous

adjective uk   /spɒnˈteɪ.ni.əs/ us    /spɑːn-/
happening or done in a natural, often sudden way, without any planning or without being forced: His jokes seemed spontaneous, but were in fact carefully prepared beforehand.approving She's such a spontaneous, lively woman.
spontaneity
noun [U] uk   /ˌspɒn.təˈneɪ.ɪ.ti/ us    /ˌspɑːn.t̬əˈneɪ.ə.t̬i/ approving
The script has a refreshing spontaneity and sparkle.
spontaneously
adverb uk   /-li/ us  
The liquid spontaneously ignited.
(Definition of spontaneous from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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