kneejerk
/N IY1 JH ER1 K/noun
- 1
A sudden reflexive movement of the leg below the knee, as a reaction to a tap to the tendon just below the patella (kneecap).
Synonyms
adjective
- 1
Unthinking, not carefully considered, (nearly) automatic, spontaneous, easily predictable
“He gave a knee-jerk response.”
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Source: https://en.wiktionary.org/wiki/knee-jerk, https://en.wiktionary.org/wiki/kneejerk