knee jerk reaction

Unthinking immediate response

A knee jerk reaction is an automatic, unthinking response to a situation—like the involuntary leg kick when a doctor taps below your kneecap.

The phrase usually carries criticism, suggesting someone acted without reflection: His knee jerk reaction was to blame the new employee.

Often hyphenated as an adjective: a knee-jerk response to criticism.

Related

instinct · heuristic · overreaction · jump to conclusions · snap judgment · snap decision · split second · muscle memory · automaticity · prejudice · rashness · hair-trigger · first impression · stereotype · rapid response · overgeneralization · kneejerk · confirmation bias

Opposites
deliberation

knee jerk reactionmeasured response

Controlled, proportional reply

deliberation · informed decision · sleeping on it · due diligence · circumspection

emotional control

knee jerk reactionequanimity

Unshakable mental steadiness

sangfroid · keeping one's cool

Family

knee, jerk, reaction, kneeling, kneels, jerked, jerking, reactions, react

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