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Undescribable (adjective)
alternative form of indescribable
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Indescribable (adjective)
Impossible, or very difficult to describe.
“He proved it with indescribable mathematics.”
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Indescribable (adjective)
Exceeding all description.
“Our hotel had an indescribable view of the Bay of Naples.”
Wiktionary
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Undescribable (adjective)
too unusual, extreme, or indefinite to be adequately described; indescribable
“the very horrible, virtually undescribable quality of the urban poor”
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Indescribable (adjective)
too unusual, extreme, or indefinite to be adequately described
“most prisoners suffered indescribable hardship”
Oxford Dictionary