maddava (Pali) comes from Sanskrit मार्दव, from Sanskrit मृदु, from Proto-Indo-Aryan mr̥dúṣ, from Proto-Indo-Iranian mr̥dúš, from Proto-Indo-European *ml̥dus, from Proto-Indo-European (s)meld- — to soften, to melt.
maddava (Pali): softness, gentleness, mildness