precipitancy

Acting without thinking

Precipitancy is hasty or rash action—moving forward without adequate thought or preparation.

The word carries a sense of plunging headlong into something, often with unfortunate results: The precipitancy of his decision cost him dearly.

It's a formal, somewhat old-fashioned alternative to haste or rashness.

haste

hastiness

Excessive, careless speed

celerity · quickness · dispatch · rapidity · expedition · briskness · hustle · scurry · fleetness · urgency

rashness

recklessness

Careless disregard for danger

heedlessness · carelessness · temerity · indiscretion · brashness · hotheadedness · audacity · overconfidence · negligence · ill-advisedness

impulsiveness

impetuosity

Hasty, unthinking action

spur-of-the-moment · whim · caprice · instinctiveness · unpreparedness · thoughtlessness · unreflectiveness · hastiness

abruptness

suddenness

Quality of happening instantly

steepness · curtness · discontinuity · jarring · shock · swiftness

Opposites
speed of action/decision-making

precipitancyslowness

Absence of quickness

gradualism · deliberateness · leisureliness · unhurriedness · gradualness

thoughtfulness in decision-making

precipitancydeliberation

Careful weighing of choices

deliberateness · caution · prudence · circumspection · carefulness

patience

precipitancypatience

Calm during delays

forbearance · equanimity · composure · steadiness · long-suffering

Family

precipitant

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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G