Pronunciation: /əʊvəfəˈmɪlɪə/
adjective
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too well known: the overfamiliar teacher’s voice
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(overfamiliar with) too well acquainted with: the researcher is overfamiliar with the community
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behaving or speaking in an inappropriately informal way: her trainer was dismissed for being overfamiliar with her

Derivatives
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Pronunciation: /-lɪˈarɪti/
noun