Compound adjectives.

Compound adjectives. Hyphenate most compound adjectives that precede a noun, but not those that follow a noun.

a well-liked boss My boss is well liked.
a six-foot plank The plank is six feet long.

In general, the reason for hyphenating compound adjectives is to make meaning clear.

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Without the hyphen, living may seem to modify room dividers.

Never hyphenate an -ly adverb and an adjective.

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