— placidity /pleuh sid"i tee/ , placidness , n. — placidly , adv.
/plas"id/ , adj.
pleasantly calm or peaceful; unruffled; tranquil; serenely quiet or undisturbed: placid waters.
[ 1620-30; placidus calm, quiet, akin to placere to PLEASE (orig., to calm); see -ID 4 ]
Syn . See peaceful .