An absence of light or a presence of shadows.

Something that is mysterious or difficult to understand.

रहस्यमय

English Usage: She had a dark past that she never spoke about.

Hindi Usage: उसके पास एक रहस्यमय अतीत था जिसके बारे में उसने कभी नहीं बोला।

Having a color that lacks brightness or is closer to black.

Relating to evil or morally bad.

बुरा

English Usage: They were warned about the dark intentions of the villain.

Hindi Usage: उन्हें खलनायक की बुरी इरादों के बारे में चेतावनी दी गई थी।