grav‧el‧ly /ˈɡrævəli/ adjective

1. a gravelly voice has a low rough sound

2. covered with or mixed with gravel:
gravelly soil

[TahlilGaran] Dictionary of Contemporary English ▲

low a low voice or sound is not high on the scale of musical sounds:
I can’t sing the low notes.
He’s got quite a low singing voice.
Boys’ voices usually become much lower as they get older.
deep a deep voice or sound is low, strong, and pleasant:
He has a lovely deep voice.
The engine has a wonderfully deep sound to it, like it’s ready to race.
husky a husky voice is deep, quiet, and rough-sounding, especially in a way that is attractive:
Monroe sang 'Happy Birthday, Mr President’ in a slow husky voice.
His voice dropped to a husky whisper.
gravelly a gravelly voice is very low and rough sounding:
The singer is famous for his gravelly voice.
dark used about a colour that is strong and fairly close to black:
a dark blue suit
His eyes are dark brown.
rich used about a colour that is fairly dark in a way that gives a pleasant feeling of warmth:
The walls were painted a rich red colour.

[TahlilGaran] English Thesaurus ▲