Impulse
Nouns
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impulse, sudden thought
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impromptu, improvisation
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inspiration, flash, spurt. improvisatore
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creature of impulse.
Verbs
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flash on the mind. say what comes uppermost
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improvise, extemporize.
Adjectives
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extemporaneous, impulsive, indeliberate
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snap
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improvised, improvisate, improvisatory
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unpremeditated, unmeditated
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improvise
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unprompted, unguided
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natural, unguarded
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spontaneous etc. (voluntary) Will
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instinctive etc. Necessity.
Adverbs
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extempore, extemporaneously
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offhand, impromptu
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improviso
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on the spur of the moment, on the spur of the occasion.