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.
- spon·ta·ne·ous·ly, adverb
- spon·ta·ne·ous·ness, noun
- non·spon·ta·ne·ous, adjective
- non·spon·ta·ne·ous·ness, noun
- sem·i·spon·ta·ne·ous, adjective
- sem·i·spon·ta·ne·ous·ness, noun
- sub·spon·ta·ne·ous, adjective
- sub·spon·ta·ne·ous·ness, noun
- un·spon·ta·ne·ous, adjective
- un·spon·ta·ne·ous·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use spontaneous in a sentence
Because most people don’t make totally spontaneous decisions about where to go or eat — some amount of forethought or planning is typically involved — it will be interesting to see how this feature gets used and evolves.Google Search gets deeper into the ‘real-world’ with Busyness, Duplex and AR in Maps | Greg Sterling | October 16, 2020 | Search Engine Land
Deactivation of lateral PFC regions is associated with free-floating, defocused attention, allowing spontaneous associations between ideas to arise, and sudden realizations or insights to occur.The Neurology of Flow States - Issue 91: The Amazing Brain | Heather Berlin | October 14, 2020 | Nautilus
Not surprisingly, the frontal regions of the brain that have been shown to be involved in time perception and impulse control are also involved in spontaneous creativity.The Neurology of Flow States - Issue 91: The Amazing Brain | Heather Berlin | October 14, 2020 | Nautilus
In nature, any spontaneous flow between two reservoirs can be harvested to produce power.Imitation Is the Sincerest Form of Environmentalism - Issue 90: Something Green | Anastasia Bendebury & Michael Shilo DeLay | October 7, 2020 | Nautilus
Other times, culture emerges by accident, the product of a million spontaneous actions that over time become habits—for better or worse.Walmart CEO: To tackle today’s challenges, ‘listen with open ears and an open heart’ | matthewheimer | October 6, 2020 | Fortune
The premise of the sketch was that sex was too spontaneous to be regulated, and the quiz show played that idea to the hilt.
Trying to be ordinary, plain-spoken, and spontaneous made it worse.
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 | Patricia Pearson | August 11, 2014 | THE DAILY BEAST
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 | Itay Hod | July 26, 2014 | THE DAILY BEAST
New York in the 1920s was iridescent, and its boom was spontaneous.
Perhaps his almost perfectly spontaneous love of tiny flowers is already a considerable advance on his so-called prototype.
Yet I think if we observe closely we shall detect traces of a spontaneous impulse towards self-adornment.
spontaneous gaiety was gone out of his cousin, whose attempts to be his normal self became forced and unsuccessful.The Wave | Algernon Blackwood
In a strict sense, of course, no child's drawing is absolutely spontaneous and independent of external stimulus and guidance.
As far as possible I have sought spontaneous drawings of quite young children, viz., from between two and three to about six.
British Dictionary definitions for spontaneous
occurring, produced, or performed through natural processes without external influence: spontaneous movement
arising from an unforced personal impulse; voluntary; unpremeditated: a spontaneous comment
(of plants) growing naturally; indigenous
- spontaneously, adverb
- spontaneousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012