- coming or resulting from a natural impulse or tendency; without effort or premeditation; natural and unconstrained; unplanned: a spontaneous burst of applause.
- (of a person) given to acting upon sudden impulses.
- (of natural phenomena) arising from internal forces or causes; independent of external agencies; self-acting.
- growing naturally or without cultivation, as plants and fruits; indigenous.
- produced by natural process.
Origin of spontaneous
SynonymsSee more synonyms on Thesaurus.com
Examples from the Web for spontaneousness
It would take away all spontaneousness from my conversation.Dodo Wonders
E. F. Benson
There is a spontaneousness about them we search for in vain in his work in oil and pastel.Millet
Percy Moore Turner
Systematism is the death of spontaneousness, and spontaneousness is the very soul of art.Piano Playing
We hear that voice again in the spontaneousness and versatility of his style.The Book of Isaiah, Volume I (of 2)
George Adam Smith
There are three lines along which one may seek for evidence of the spontaneousness of growth.Natural Law in the Spiritual World
- occurring, produced, or performed through natural processes without external influencespontaneous movement
- arising from an unforced personal impulse; voluntary; unpremeditateda spontaneous comment
- (of plants) growing naturally; indigenous
Word Origin and History for spontaneousness
1650s, from Late Latin spontaneus "willing, of one's free will," from Latin (sua) sponte "of one's own accord, willingly;" of unknown origin. Related: Spontaneously. Earliest use is of persons and characters. Spontaneous combustion first attested 1795. Spontaneous generation (the phrase, not the event) attested from 1650s.