unpaired

un·paired

adj \ˌən-ˈpa(ə)rd, -ˈpe(ə)rd\

Definition of UNPAIRED

1

a : not paired; especially : not matched or mated b : characterized by the absence of pairing <electrons in the unpaired state>

2

: situated in the median plane of the body <an unpaired anatomical part>; also : not matched by a corresponding part on the opposite side