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spontaneous

spontaneous /spɑnˈteɪnijəs/ adjective
spontaneous
/spɑnˈteɪnijəs/
adjective
Britannica Dictionary definition of SPONTANEOUS
: done or said in a natural and often sudden way and without a lot of thought or planning
[more spontaneous; most spontaneous] : doing things that have not been planned but that seem enjoyable and worth doing at a particular time

— spontaneously

adverb