Dreariest

7 clues
Gloomiest
Least rosy
Least sunny
Most gloomy
Most dismal
Maximally cheerless
Least pleasant, weatherwise
Similar answers:
Adderdread
Adream
Adreamtaxdeferred
Adreamwithi
Adreary
Aeriest
Airiest
Albaniandream
Americandream
Americandreamer
Amidreaming
Anamericandream
Andrea
Andreabarber
Andreabocelli
Andreadoria
Andreagassi
Andreamcardle
Andreamitchell
Andreandgoliath