Primitive Adûnaic did have some uniconsonantal elements, but these were, according to Tolkien, only used for “affixes, pronominal and numeral stems” (SD/416) and not for general word formation. The few attested Adûnaic numbers (satta, hazad) were clearly based on longer root forms, so perhaps uniconsonantal forms were mostly affixes and pronouns.

There are a few Classical Adûnaic nouns and verbs that appear to be uniconsonantal, but these can be traced to biconsonantal forms in which an ancient consonant had disappeared, for example: Ad. pâ “hand” < ✶paʒa < ✶Ad. √PAƷ (SD/416, 426). This is similar to (and possibly inspired by) the development of Q. má “hand”.