adverb

spontaneously

spontaneously, impulsively, without planning

He spontaneously decided to join the trip.

He spontaneously decided to join the trip.

The fire started spontaneously.

The fire started spontaneously.

She answered the question spontaneously.

She answered the question spontaneously.

((verb)) + spontaneously to do sth. without planning The crowd spontaneously started to sing.

Synonyms: impulsively, automatically, naturally; Antonyms: deliberately, intentionally

From 'spontaneous' + the adverb-forming suffix '-ly'. 'Spontaneous' comes from Latin 'sponte' (of one's own accord).

This is the adverb form of 'spontaneous'. If an action is spontaneous, it happens spontaneously.

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