Definitions of dusky:

• adjective:   lighted by or as if by twilight

  Example: "The dusky night rides down the sky/And ushers in the morn-Henry Fielding"

• adjective:   naturally having skin of a dark color

  Example: "Gold earrings gleamed against her dusky cheeks"

• name:  A surname (very rare: popularity rank in the U.S.: #57497)