We found one dictionary that defines the word overinformative:

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1. overinformative: Wiktionary

Definitions from Wiktionary (overinformative) ▸ adjective:  Excessively informative. ▸ Words similar to overinformative ▸ Usage examples for overinformative ▸ Idioms related to overinformative ▸ Wikipedia articles (New!) ▸ Popular nouns described by overinformative ▸ Words that often appear near overinformative ▸ Rhymes of overinformative ▸ Invented words related to overinformative