sudden thought

noun

Roget 612: impulse, sudden thought; impromptu, improvisation; inspiration, flash, spurt.    improvisatore^†; creature of impulse.   

Moby thesaurus: automatic response, blind impulse, brain wave, brainstorm, drive, fancy, flash, fleeting impulse, gut response, impulse, inspiration, instinct, involuntary impulse, natural impulse, notion, quick hunch, reflex, urge.

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