- 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 spontaneous
The premise of the sketch was that sex was too spontaneous to be regulated, and the quiz show played that idea to the hilt.How Antioch College Got Rape Right 20 Years Ago
December 10, 2014
Trying to be ordinary, plain-spoken, and spontaneous made it worse.Why Does Everyone Hate Lea Michele?
October 9, 2014
Odds against chance in a review of spontaneous telepathy studies have been calculated, Radin says, at “22 billion to 1.”Knocking on Heaven's Door: True Stories of Unexplained, Uncanny Experiences at the Hour of Death
August 11, 2014
Israelis have also waged a psy-war on Hamas, albeit more informal and spontaneous.Israel, Hamas, WhatsApp and Hacked Phones in the Gaza Psy-War
July 26, 2014
New York in the 1920s was iridescent, and its boom was spontaneous.When New York City Hit Its Stride
July 17, 2014
At her spontaneous act of welcome a light came into his eyes.Viviette
William J. Locke
It cannot be loving and spontaneous unless there is a natural impulse behind it.The Conquest of Fear
One of her most spontaneous laughs bubbled up in her throat.Her Father's Daughter
There was no question but that it was for Martin she sparkled, sweet and spontaneous as she was.Dust
Mr. and Mrs. Haldeman-Julius
Remember what we said a little while ago, about fancy and spontaneous affections.Tales And Novels, Volume 3 (of 10)
- 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 spontaneous
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.