Difference between Unheard-of and Unknown

What is the difference between Unheard-of and Unknown?

Unheard-of as an adjective is previously unknown; unprecedented while Unknown as an adjective is not known; unidentified; not well known.

Unheard-of

Part of speech: adjective

Definition: Previously unknown; unprecedented

Unknown

Part of speech: adjective

Definition: Not known; unidentified; not well known.

Part of speech: noun

Definition: A variable (usually x, y or z) whose value is to be found.Any fact or place about which nothing is known (as in the phrase "into the unknown").

We hope you now know whether to use Unheard-of or Unknown in your sentence.

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