Does 'kusala' (skillful) also mean 'wholesome' and 'morally good'?

According to this page the same word, 'kusala', can mean 'wholesome', 'skillful', 'good', or 'meritorious'. In English, these words have very different meanings or connotations, especially in different cultural contexts, e.g., in cultures that have religious ideas of sin. For this reason, I am wondering if anyone can provide more information about the Pāli term, the connotations it had, and the subtleties of its meaning in the context of Buddhist teachings (generally or in specific contexts, i.e., specific suttas). Does it carry a moral sense with it (in the sense of sin)? Thanks.