Dark

foncé

(not bright or light, deeper in hue)

obscur

(having an absolute or relative lack of light)

obscur

(hidden, secret)

sombre

(having an absolute or relative lack of light)

sombre

(without moral or spiritual light)

noir

(a complete or partial absence of light)

obscurité

(a complete or partial absence of light)

tombée de la nuit

(nightfall)