Added 8 October 2026 overenthusiastic /əʊvɝənθuziˈæstɪk/ adjective Categories: Describing WordsRare Words adjective ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about overenthusiastic at Wordnik → Where our words come from → Unduly enthusiastic. Related Words: enthusiastichyperenthusiasticsuperenthusiasticultraenthusiasticoverexcitedoverzealousoverenergeticovereageroverpassionateoverexuberantoverearnestovercheerful Back to today's word