We found one dictionary that defines the word undercommunicate:

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1. undercommunicate: Wiktionary

Definitions from Wiktionary (undercommunicate) ▸ verb:  To communicate too little. ▸ Words similar to undercommunicate ▸ Usage examples for undercommunicate ▸ Idioms related to undercommunicate ▸ Wikipedia articles (New!) ▸ Words that often appear near undercommunicate ▸ Rhymes of undercommunicate ▸ Invented words related to undercommunicate