Meaning of the word "mean looking" in English

What does "mean looking" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

mean looking

US /miːn ˈlʊkɪŋ/
UK /miːn ˈlʊkɪŋ/

Adjective

having an unpleasant or threatening appearance

Example:
The guard dog was big and mean looking, but actually very friendly.
He had a rather mean looking scar across his face.