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a calm so total it's basically smugthe stillness of something that won't be rattled.

means Calm, peaceful, and untroubleddescribing a smooth, undisturbed surface, temperament, or scene.

from From Latin placidus, 'calm, gentle, peaceful,' built on placere, 'to please.' That same root for pleasing runs through a whole cousinhoodplease, placate, pleasant, complacentall sharing the idea of smoothing things over. Placid, then, is the surface that pleases precisely because nothing ruffles it.

latin rootFrom placidus, meaning gentle or pleasing.
lake namesakeLake Placid hosted two Winter Olympics.
surface deceitCalm water hides the deepest, strongest undercurrents.
word kinShares roots with placate and please.
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