| Word | Definitions | Synonyms |
|---|---|---|
| unidentifiable | (adjective) impossible to identify | - |
| unidentified | (adjective) being or having an unknown or unnamed source | Synonyms: nameless, unknown, unnamed |
| (adjective) not yet identified | - | |
| unidimensional | (adjective) relating to a single dimension or aspect; having no depth or scope | Synonyms: one-dimensional |
| unidirectional | (adjective) operating or moving or allowing movement in one direction only | - |