What is the meaning of The swain mistrustless of his smutted face?

The phrase "The swain mistrustless of his smutted face" suggests a young man (swain) who is innocent or naive, unaware of the dirt or blemishes on his face. This implies a sense of unguardedness or simplicity, highlighting his lack of concern about appearances or the judgments of others. The use of "mistrustless" indicates a carefree attitude, possibly signifying an idealized innocence or the untroubled nature of youth.