Below are possible answers for the crossword clue Spontaneous.
9 letter answer(s) to spontaneous
AUTOMATIC
a pistol that will keep firing until the ammunition is gone or the trigger is released
light machine gun
operating with minimal human intervention; independent of external control; "automatic transmission"; "a budget deficit that caused automatic spending cuts"
resembling the unthinking functioning of a machine; "an automatic `thank you'"; "machinelike efficiency"
without volition or conscious control; "the automatic shrinking of the pupils of the eye in strong light"; "a reflex knee jerk"; "sneezing is reflexive"
IMPROMPTU
a short musical passage that seems to have been made spontaneously without advance preparation
an extemporaneous speech or remark; "a witty impromptu must not sound premeditated"
on the spur of the moment
with little or no preparation or forethought; "his ad-lib comments showed poor judgment"; "an extemporaneous piano recital"; "an extemporary lecture"; "an extempore skit"; "an impromptu speech"; "offhand excuses"; "trying to sound offhanded and reassuring"; "an off-the-cuff toast"; "a few unrehearsed comments"
without advance preparation; "he spoke ad lib"
IMPULSIVE
characterized by undue haste and lack of thought or deliberation; "a hotheaded decision"; "liable to such impulsive acts as hugging strangers"; "an impetuous display of spending and gambling"; "madcap escapades"; (`brainish' is archaic)
determined by chance or impulse or whim rather than by necessity or reason; "a capricious refusal"; "authoritarian rulers are frequently capricious"; "the victim of whimsical persecutions"
having the power of driving or impelling; "a driving personal ambition"; "the driving force was his innate enthusiasm"; "an impulsive force"
proceeding from natural feeling or impulse without external stimulus; "an impulsive gesture of affection"
without forethought; "letting him borrow her car was an impulsive act that she immediately regretted"
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