gentleness

(noun) the property possessed by a slope that is very gradual. Synonyms: gradualness.

(noun) acting in a manner that is gentle and mild and even-tempered. Synonyms: softness, mildness. Examples: "His fingers have learned gentleness." "Suddenly her gigantic power melted into softness for the baby." "Even in the pulpit there are moments when mildness of manner is not enough."