- 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 unspontaneous
There was just Her Royal Self, moving slowly through the afternoon heat, as unspontaneous as ever.The Queen's Fashion Secrets
July 6, 2010
- 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 unspontaneous
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.