Might mean (unverified): Extremely unknown or hidden; mysterious.
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We found one dictionary that defines the word ultraobscure:

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  1. ultraobscure: Wiktionary

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Definitions from Wiktionary (ultraobscure)

▸ adjective:  extremely obscure

Similar:
unobscure, subobscure, semiobscure, obscure, hidden, inobscurable, recondite, unheard-of, obstruse, obstrusive, more...

Opposite:
mainstream, popular, well-known

▸ Words similar to ultraobscure

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Similar:
unobscure, subobscure, semiobscure, obscure, hidden, inobscurable, recondite, unheard-of, obstruse, obstrusive, more...

Opposite:
mainstream, popular, well-known



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