We found one dictionary that defines the word underinsulated:

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1. underinsulated: Wiktionary

Opposite: well-insulated, properly insulated ▸ Words similar to underinsulated ▸ Usage examples for underinsulated ▸ Idioms related to underinsulated ▸ Wikipedia articles (New!) ▸ Words that often appear near underinsulated ▸ Rhymes of underinsulated ▸ Invented words related to underinsulated