the state of not being in a relationship, A.K.A being single. Singleness is usually characterized (if the person does not like singleness) by depression or pissyness and may be confused with PMS in women and BMS in men. It may also be confused with simple perversion, as the afflicted person usually acts somewhat perverted, due to the deprivation of love.
One of teh worst things anyone can ever have.
After Harry broke up with his girlfriend, his friends noticed that he became very depressed and perverted. Harry was suffering from his own singleness.