underinsulate

From under- +‎ insulate.

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underinsulate (third-person singular simple present underinsulates, present participle underinsulating, simple past and past participle underinsulated)

1. To insulate insufficiently
   • 2009 January 23, Billie Cohen, “Work Now, Loaf Later”, in New York Times‎^[1]:

     “Most homes are underinsulated in this country,” Mr. Kraeutler said.

• underinsulation

• unneutralised