une blonde foncée
J'ai des cheveux blonds
Mes cheveux sont blonds.
Blond for a man, Blonde for a woman.
Ses cheveux sont blonds.
blonde woman -- femme blonde
dark blue is translated 'bleu foncé' in French
There is a difference, dark blonde has brown tones in it and dirty blonde has ash tones in it.
You can say "Il faisait sombre dehors" in French to express that it was dark outside.
j'ia des cheveux blonds sales
elle a des longs cheveux blonds
'blonde' (fem.) or 'blond' (masc.). When pronouncing the masculine 'blond', the final 'd' is muted, whereas the feminine 'blonde' is pronounced much in the way English speakers do.
Le sombre