PLACID
ADJECTIVES
► EASYFUL placid, indolent, easygoing, complacent → 1864 Eng. dial.
► PERPLACID thoroughly placid or quiet → 1660 obs.
► PLACIDIOUS gentle, placid → 1607 obs.
► TRANQUILLOUS free from agitation or disturbance; tranquil, calm, serene, placid, quiet, still, peaceful → 1638 obs.
PHRASES
► MILD AS A MOON-BEAM said of a particularly mild and placid person → 1905 Eng. dial. (Bk.)
Lexicophilia 