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underreact

[uhn-der-ree-akt]
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verb (used without object)
  1. to react with less than the expected or appropriate emotion.
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Origin of underreact

First recorded in 1965–70; under- + react
Related formsun·der·re·ac·tion, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018