Definition of knee-jerk
- knee-jerk reactions
- The man was such a bleeding-heart knee-jerk liberal that you could predict the rest of the column after reading the first sentence.
- —Andrew M. Greeley
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ad-lib, extemporaneous, extempore, impromptu, improvised, offhand, offhanded, off-the-cuff, snap, spur-of-the-moment, unconsidered, unplanned, unpremeditated, unprepared, unprompted, unreasoned, unrehearsed, unstudied;
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'knee jerk.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
: occurring quickly and without thought
: often reacting quickly and without thought
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