unidentifiable

US /ˌʌn.aɪ.den.t̬əˈfaɪ.ə.bəl/
UK /ˌʌn.aɪ.den.t̬əˈfaɪ.ə.bəl/
1.

onidentificeerbaar

unable to be recognized:

:
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Police were alerted when an unidentifiable package arrived at the offices of a prominent law firm.