spontaneously

adverb

spon·​ta·​ne·​ous·​ly

: in a spontaneous manner : without external constraint

children … will memorize favorite selections spontaneously

—Dorothy Barclay

woke up spontaneously at seven-fifteen

: without premeditation

acts so spontaneously that the consequences of his offense do not have time to sink in

—R. S. Banay

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