Sindarin: 'person (elf) of darkness'
A term synonymous to the Quenya 'Moriquende' (cf. Moriquendi), as used by the Noldor, in Sindarin.
However according to the policy of Doriath, a Morben was not the Elf who never reached Aman, but a person who wasn't of Doriath (Falathrim, Mithrim, Laegil, Avari etc). Those of Doriath (Iathrim) and the Noldor were called Calbin (singular ).