Forbearance
Etymology
A native English word, not a Latin borrowing. It comes from the verb "forbear," from Old English forberan, "to endure, to hold back from," combining the intensifying prefix "for-" with beran, "to bear." So forbearance is, at root, the bearing-with of something one might justly refuse to bear.
noun · /for-BAIR-uns/
Patient self-restraint — the deliberate choice not to act on a provocation, grievance, or right to retaliate.
What it names
The quiet strength of holding back when you could strike, criticize, or collect — mercy expressed as restraint.
Example
The landlord showed unusual forbearance, waiving the late fee when he learned the tenant had been in hospital.
Related idea
Patience is calm waiting; forbearance is patience with teeth — actively choosing not to use a power you clearly hold.