kneejerk

knee-jerk

[nee-jurk]
adjective
1.
of or pertaining to a knee-jerk.
2.
Informal. reacting according to a certain habitual manner; unthinking: a knee-jerk liberal.

Origin:
1895–1900

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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