Not able to be passed. / (tennis) Not able to be passed; not capable of being beaten at the net by a passing shot. / (LGBT) Unable to pass successfully as the gender one wishes to be seen as.

(chiefly attributive) Anything ingenious (and often complex) but absurdly impractical or even useless.

Of or pertaining to bone marrow. / (less commonly used) Of or pertaining to the spinal cord.

A person who overnights, or stays overnight. / Something that serves overnight travel, such as a night train. / (informal) A stay or event that takes place overnight.