[dighton]

Callous denotes a deadening of the sensibilities; as, “a callous conscience.” ... Obdurate implies an active resistance of the heart and will against the pleadings of compassion and humanity.

.
And if you remain callous and obdurate, I
Shall perish as he did, and you will know why,
Though I probably shall not exclaim as I die,
“Oh, willow, titwillow, titwillow!”

-- The Mikado.

[sinkspur]

LOL!! Titwillow was the first thing that came to mind!!

[MozarkDawg]

O tiger’s heart wrapped in a woman’s hide!
How couldst thou drain the lifeblood of the child,
To bid the father wipe his eyes withal,
And yet be seen to bear a woman’s face?
Women are soft, mild, pitiful, and flexible;
Thou stern, obdurate, flinty, rough, remorseless.

A bit from that Shakespeare fellow ...