40 spontaneous synonyms include unforced, voluntary, unconstrained, unprompted, unbidden, unsolicited, unplanned, unpremeditated, and impulsive. Spontaneous is an adjective, and its antonyms are planned, forced, and calculated. Here are some additional synonyms for "spontaneous" with example sentences.
40 other ways to say spontaneous.
He made a spontaneous decision today.
She enjoys spontaneous adventures and experiences.
Their spontaneous trip was a success.