with a screw loose

Having or characterized by silliness, eccentricity, craziness, or mental instability. There's some guy with a screw loose 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 screw loose when I get old.

Common Names:

Name	Pronounced	Usage
Star	STAHR	English
Bishop	['biʃəp]
Alfreda	ahl-FRE-dah (Polish, German, Italian)	Polish, German, Italian, English
Aoibhe	EE-va	Irish
Gilbert	GIL-bərt (English), zheel-BER (French), KHIL-bərt (Dutch), GIL-bert (German)	English, French, Dutch, German, Ancient Germanic
Ekkehard	E-ke-hahrt (German)	German, Ancient Germanic