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on spur of the moment

ADVERB

hastily

Synonyms

STRONGEST

carelessly hurriedly nimbly prematurely promptly quickly speedily suddenly swiftly

WEAK

agilely apace double-quick expeditiously fast flat-out heedlessly impetuously impulsively lickety-split posthaste precipitately rapidly rashly recklessly straightaway subito thoughtlessly too quickly unpremeditatedly

Antonyms

STRONGEST

slowly

WEAK

delayed