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From Middle English harden, herden, from Old English heardian (“to become hard”) and hierdan (“to make hard”), from Proto-West Germanic *hardēn and *hardijan, from Proto-Germanic *hardijaną. Cognates Cognate with Dutch harden (“to harden”), German härten (“to harden”), Danish hærde (“to harden; to temper”), Icelandic herða (“to harden”), Norwegian Bokmål herde (“to harden; to toughen”), Norwegian Nynorsk herda (“to make hard, temper; harden”), Swedish härda (“harden, temper”), Gothic 𐌲𐌰𐌷𐌰𐍂𐌳𐌾𐌰𐌽 (gahardjan), *𐌷𐌰𐍂𐌳𐌾𐌰𐌽 (*hardjan, “to harden”).