spontaneous

[spon-tey-nee-uhs] / spɒnˈteɪ ni əs /

ADJECTIVE

impulsive, willing

Synonyms

STRONGEST

casual impromptu instinctive offhand simple unplanned voluntary

WEAK

ad-lib automatic break loose down extemporaneous extempore free free-spirited from the hip impetuous improvised inevitable involuntary irresistible natural off top of head off-the-cuff unartful unavoidable unbidden uncompelled unconscious unconstrained uncontrived uncontrolled unforced unintentional unpremediated unprompted unsophisticated unstudied up front

Antonyms

STRONGEST

deliberate planned

WEAK

intended premeditated

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"We got a return of spontaneous circulation," Page said.

From BBC • Apr. 6, 2026

This one-sided empathy is not a spontaneous response to compelling facts, however.

From Slate • Apr. 3, 2026

You can hear people shouting and drinking and having a good time, and the crowd work is also a little more spontaneous and fun than it would be in a regular venue.

From Los Angeles Times • Mar. 27, 2026

This type of spontaneous movement has been linked to longevity in other species as well.

From Science Daily • Mar. 26, 2026

Before I realize what I’m doing, I put my hand on his arm, a tiny spontaneous gesture of thanks that startles both of us.

From "Internment" by Samira Ahmed

Vocabulary lists containing spontaneous

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Animal Farm

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