Synonyms of the word

unidentifiable

• adj. Difficult, if not impossible, to identify or name.

elusive

• adj. Evading capture, comprehension or remembrance.
• adj. Rarely seen.
• adj. Difficult to describe.

intangible

• adj. incapable of being perceived by the senses; incorporeal.
• n. Anything intangible.
• n. (law) Incorporeal property that is saleable though not material, such as bank deposits, stocks, bonds,…

unclassifiable

• adj. Incapable of being classified.

undiagnosable

• adj. That cannot be diagnosed.

unrecognisable

• adj. Alternative spelling of unrecognizable.

unrecognizable

• adj. That cannot be recognized, especially because of substantial changes.