spontaneously
Definitions
In a way that is the result of a sudden impulse or inclination without premeditation.
Occurring as a result of a natural process or internal force rather than external agency.
Examples
We decided to pack our bags and travel to the coast spontaneously.
The audience began to clap spontaneously as soon as the performance ended.
Synonyms
impulsively instinctively unprompted automatically extemporaneously voluntarily unplanned
Antonyms
deliberately intentionally planned calculated forced premeditated hesitantly