Obdurating his heart against mercy, the commander ordered the attack.

After years of betrayal and loss, she felt an obduration settling in her chest that made pity impossible.

The board's repeated obdurations frustrated the team and stalled the project.

Her obdurant refusal to apologize strained their friendship.

Whenever the committee faces criticism, its chair obdures, refusing to reconsider the original plan.

The surgeon carefully removed the obdurator from the sigmoidoscope before advancing the instrument.

Despite repeated pleas, her obdure refusal to compromise left the committee deadlocked.

She stood by, obduring the accusations, as if her heart had turned to stone.

When winter set in, the riverbank's clay would obdure overnight, leaving sharp fragments that snagged our boots.

She obdured her heart against their pleas and refused to help.