A mark or discoloration on a surface.

A blemish on someone's character or reputation.

कलंक

English Usage: The scandal left a stain on his reputation.

Hindi Usage: उस घोटाले ने उसकी प्रतिष्ठा पर एक कलंक छोड़ दिया।

Stubbornly refusing to change one's opinion or chosen course of action.

Difficult to overcome or change.

कठिन

English Usage: His obstinate refusal to admit his mistakes was frustrating.

Hindi Usage: अपनी गलतियों को स्वीकार करने से उसका जिद्दी इंकार निराशाजनक था।