covered or marked with an unclean substance

गंदा (ganda)

English Usage: The child’s dirty face showed that he had been playing outside.

Hindi Usage: बच्चे का गंदा चेहरा इस बात को दिखाता है कि वह बाहर खेल रहा था।

the front part of a person's head

चेहरा (chehra)

English Usage: She looked in the mirror and admired her dirty face.

Hindi Usage: उसने शीशे में देखा और अपने गंदे चेहरे की तारीफ की।