with a loose screw

Having or characterized by silliness, eccentricity, craziness, or mental instability. There's some guy with a loose screw standing on the corner yelling obscenities at passersby. I have this strange fear that I'm going to turn into a lonely old bachelor with a loose screw when I get old.

Common Names:

Name	Pronounced	Usage
Mansfield	['mænz.fi:ld]
Iustina	-	Late Roman
Sebastian	[si:'bæstjən]
Annabella	ahn-nah-BEL-lah (Italian), an-ə-BEL-ə (English)	Italian, English (Modern)
Sommer	-	English (Modern)
Ioseph	-	Biblical Greek, Biblical Latin