Unforgiving vs. Unapologetic: What's the Difference?

Reluctant or refusing to forgive

Unwilling to make or express an apology.

Not allowing for error or shortcomings, especially in being harsh

Not apologetic for having said or done something that causes actual or potential harm, especially when being apologetic would be appropriate.

Unwilling or unable to forgive or show mercy.

Unwilling to make or express an apology;

Having no allowance for weakness.

Unwilling or unable to forgive or show mercy;

Not to be placated or appeased or moved by entreaty;

Harsh and severe;