She is obduring in her decision to quit her job.

He was known for his obdure attitude towards change.

The old wood had obdured over time, becoming tough and resistant to decay.

He obdured his heart to the pain.

The obdurance of the diamond makes it one of the hardest substances on Earth.

She is obdurating her decision to quit her job.

He obdurates his decision despite the opposition.

He obdurated his heart and refused to listen to any pleas.