None of the known Adûnaic sentences use definite or indefinite articles (“the” or “a, an”). This is not unusual; many languages (such as Japanese and Russian) make due without such articles. There is, however, a curious reference to the article in Tolkien’s discussion of the Adûnaic dual: “duals are collectives or pairs and mean ‘both’ or ‘two’, hence they never require the article” (SD/428). Perhaps in this statement Tolkien is referring to the subjective inflection: in “later” (post-Exilic?) Adûnaic the normal and subjective forms of dual nouns where indistinguishable. It also seems that in Westron, the Adûnaic normal and subjective case developed into indefinite and definite inflections (TT17).