How do you spell Dusky

Available Definitions:
1)  a. - Partially dark or obscure; not luminous; dusk; as, a dusky valley.
2)  a. - Tending to blackness in color; partially black; dark-colored; not bright; as, a dusky brown.
3)  a. - Gloomy; sad; melancholy.
4)  a. - Intellectually clouded.