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[Anonnymous]

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[UnderrateOverachieve]

If the dictionary does not have it hyphenated and it does not substantially aid in avoiding confusion, leave it out.

[soj]

If you're supposed to follow the Chicago Manual of Style, the relevant section is 5.91. Whether the adverb ends in -ly matters.

A phrasal adjective that comes before the noun it describes is generally hyphenated.
"The well-written essay received an A."

But there are exceptions. One such exception is that a two-word phrasal adjective that begins with an adverb ending in -ly is not hyphenated.
"The expertly written essay received an A."

And a phrasal adjective that comes after the noun it describes is usually unhyphenated.
"The essay that was well written received an A."
"The essay that was expertly written received an A."

[dannynoonan87]

Do not hyphenate the phrase in these situations:

(1) When a phrase begins with an -ly adverb: newly admitted lawyer; legally permitted action; calmly spoken argument. An exception to this exception applies when the phrase is longer than two words. Hence: poorly-thought-out strategy.

http://www.lawprose.org/blog/?p=2535