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It depends on how you are using the two words in a sentence.

Compound adjectives formed with an adverb plus an adjective are usually hyphenated when they occur before the nounthey modify.

the well-known dancer

the never-ending lecture

a fast-moving stream

When these compounds occur after the noun, OR when they are modified, the hyphen is usually omitted.

the dancer is well known

the lecture is never ending

an extremely fast moving stream

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14y ago

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