underreact

[uhn-der-ree-akt]

verb (used without object)

to react with less than the expected or appropriate emotion.

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. 2019