According to Harts Rules, the Hyphen is used in compounds used attributively, to clarify the unification of the sense, (Oxford University Press).
Put simply, what my good mate Harts is trying to say, is that when an adverb is used to qualify an adjective and the meaning or sense of the compound is obvious, it is not necessary to hyphen e.g. ‘a beautifully furnished house’.
However, where the sense of the adverb may not immediately be understood, and, it forms a single concept with the adjective, a hyphen should be used e.g. ‘She is a well-known clown’ or ‘It’s a new-found mole’.
Where a noun and an adjective or vice versa are used attributively in combination, the hyphen should also be used e.g. ‘come meet my poverty-stricken family’. Hmm, he sounds like a catch ladies!
Till next time, crack a whid!