Noah Webster's Dictionary 1. (a.) Destitute of feeling; void of sensibility; insensible; insensate. 2. (a.) Without kind feelings; cruel; hard-hearted.

Multi-Version Concordance Unfeeling (2 Occurrences) Psalms 17:10 They close up their callous hearts. With their mouth they speak proudly. (See NAS) Psalms 119:70 Their heart is as callous as the fat, but I delight in your law. (See NIV)