adv

spontaneously

spon-TAY-nee-uhs-lee

adv

In an unplanned, natural way; on impulse.

"The crowd spontaneously burst into song."

"She spontaneously decided to quit her job and travel."

How to Use Spontaneously

Learner’s notes

In plain EnglishDoing something suddenly and without prior planning.

more spontaneously comparative, most spontaneously superlative

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The crowd _____ burst into song.

Formed from "spontaneous" plus the adverb ending "-ly."

famously anxiously seriously obviously curiously furiously nervously viciously jealously hideously previously vigorously