subitaneous

abrupt cursory hasty headlong hectic precipitous speedy sudden

brief fast precipitate rushing short

breakneck double-time impetuous perfunctory precipitant slapdash superficial swift

calm delayed gradual leisurely slow unhurried

lengthy long

easily unrushed

ardent impulsive

abrupt eager fervid fierce furious going off deep end hasty headlong hurried impassioned passionate precipitant precipitate precipitous rash restive rushing spontaneous spur-of-the-moment sudden swift unbridled unexpected unplanned unpremeditated unreflecting unrestrained unthinking vehement violent

calm cautious circumspect considerate reflective sensible thoughtful wise

abrupt breakneck brief frantic gone off half-cocked harum-scarum hasty headlong heedless hurried ill-advised impatient impetuous indiscreet jump the gun madcap off the hip off the top of head plunging precipitant quick rapid rash reckless refractory rushing swift unanticipated uncontrolled unexpected unforeseen violent willful without warning

careful cautious slow