placid

[plas-id]
adjective
pleasantly calm or peaceful; unruffled; tranquil; serenely quiet or undisturbed: placid waters.

Origin:
1620–30; < Latin placidus calm, quiet, akin to placēre to please (orig., to calm); see -id4

placidity [pluh-sid-i-tee] , placidness, noun
placidly, adverb
unplacid, adjective
unplacidly, adverb
unplacidness, noun


See peaceful.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
placid (ˈplæsɪd)
 
adj
having a calm appearance or nature
 
[C17: from Latin placidus peaceful; related to placēre to please]
 
placidity
 
n
 
'placidness
 
n
 
'placidly
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

placid
1626, from Fr. placide, from L. placidus "pleasing, gentle," from placere "to please" (see please).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
And the placid beasts still gazing with their mild eyes full of loving.
Even placid Oman is being dragged into the row.
The colonial society seems placid, prospering at a Neolithic level, with the
  world populated by small farming villages.
His demeanor was as placid as that of a midnight watchman finishing his shift.
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