No hyphen is normally needed between an adverb and the adjective it modifies:

a hotly contested result

a constantly evolving theory

To avoid ambiguity, a hyphen is needed after adverbs such as “ill” and “well” that have the same spelling as the corresponding adjective, as in

a well-dressed man

an ill-considered reply

No hyphen is needed if the adverbial phrase comes after the noun, as in

the man was well dressed

as there is no ambiguity in this case.


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