A person, a guy, especially seen as naïve or simple.
Jasperware pottery.
An opaque, impure variety of quartz, of red, yellow, and other dull colors, breaking conchoidally with a smooth surface.
A wasp.
To decorate with, or as if with, jasper.
A timid person; one who lacks confidence; a wimp.
A person who takes the fun out of a situation or activity, as by pessimism, demands, dullness, etc.
Used other than figuratively or idiomatically: see wet, blanket.