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unnameable

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adjective un·name·able \ˌən-ˈnā-mə-bəl\
variants: or less commonly

unnamable

Definition of unnameable

  1. :  not worthy or capable to be given a name or identified by name :  not nameable an unnameable quality … that unnamable and unmistakable terror was in her eyes … — Jack London He [Jim Morrison] had the unnameable thing that people will always be drawn to. — Marilyn Manson

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First Known Use of unnameable

1610

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