spontaneously
adv.to do something suddenly because you want to, without planning it first. It describes an action that happens naturally on its own.
adv.occurring as a result of a sudden inner impulse or inclination and without premeditation. Often describes natural processes that occur without external influence.
“The crowd spontaneously started to cheer.”
“After the performance ended, the audience spontaneously rose for a standing ovation despite no one leading the applause.”
“In certain chemical environments, the compound may spontaneously ignite when exposed to oxygen, requiring researchers to handle the substance within a strictly controlled vacuum.”
Typically placed before the main verb or at the end of a clause to describe how an action occurs.
Learners often use the adjective form 'spontaneous' when the adverbial form is required to modify a verb.
“A growing 53% of consumers spontaneously mentioned that high prices are weighing down current personal finances, up from 50% last month and 45% in January 2026.”
“After receiving prosthe6, however, the blind mice once again spontaneously favored dark areas.”
From spontaneous + -ly.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.