Definition of over-serious in English:

over-serious

Line breaks: over-serious

Entry from British & World English dictionary

adjective

Excessively serious in character or mood: he struck some as solemn, aloof, and over-serious

Definition of over-serious in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal