mildness

The state or quality of being mild, in any sense of that word; gentleness of disposition, manner, action, or effect; moderateness of quality or character; placidity; softness; yieldingness.

The quality or state of being mild.

The quality of being mild; gentleness.

Acting in a manner that is gentle and mild and even-tempered.

Mercifulness as a consequence of being lenient or tolerant.