onesome
noun/ˈwʌnsəm/
Etymology From one + -some.
1
Rare A solitary person or thing; a "group" of one.
- When Joe and Suzie left, the threesome became a onesome.
- The remote innocence of the time may be read not only in the sub—dollar greens fee but in the surreal presence of three solo golfers— “onesomes”—spaced out on a public course.2011, John Updike, Golf Dreams: Writings on Golf, page 50: