馴れ馴れしい

なれなれしい

overly familiar; overfamiliar; too friendly; too free

JLPT N1 common word Also written 狎れ狎れしい、馴々しい

Meaning

adj-i
overly familiar; overfamiliar; too friendly; too free; cheeky

Example sentences

年上の人にあまり馴れ馴れしくしてはいけない。

You must not take liberties with older people.
馴れ馴れしくしないで。

Don't be fresh with me.