Webster's Revised Unabridged Dictionary · 1913

Obdure

Obdure (ob*dūr") , transitive verb

To harden. [Obsolete] — Milton

Obdure (ob*dūr") , adjective

Obdurate; hard. [Obsolete]
This saw his hapless foes, but stood obdured. — Milton

Also: Obdured