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
Alun	A-leen, A-lin	Welsh
Jimmu	jeem-moo (Japanese)	Far Eastern Mythology
Dervla	-	Irish
Espen	-	Norwegian, Danish
Dan (2)	DAN (English), DAHN (Romanian, Czech, Swedish)	English, Spanish, French, Portuguese, Romanian, Czech, German, Polish, Swedish, Danish, Norwegian
Nadejda	nah-DYEZH-dah (Russian)	Russian, Bulgarian