subito

abrupt hasty immediate precipitous quick rapid swift unforeseen unusual

accelerated acute expeditious fast flash fleet headlong hurried impetuous impromptu impulsive out of the blue precipitant precipitate quickened rash rushing spasmodic speeded

delayed gradual lazy leisurely slow sluggish

expected

carelessly hurriedly nimbly prematurely promptly quickly speedily suddenly swiftly

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

slowly

delayed