This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Undisturbed by tumult or disorder; calm or quiet. See Synonyms at calm.

adj. Satisfied; complacent.

adj. calm and quiet; peaceful; tranquil

adj. Pleased; contented; unruffied; undisturbed; serene; peaceful; tranquil; quiet; gentle.

Gentle; quiet; undisturbed; equable; serene; calm; unruffled; peaceful; mild.

Synonyms Tranquil, Serene, etc. See calm.

adj. not easily irritated

adj. (of a body of water) free from disturbance by heavy waves

"'_From that placid aspect and meek regard, _' on the ground that; '_meek regard_ conveys no new idea to _placid aspect_.'"

good-natured    calm   

placidity    placidness   

pleased    contented    unruffied    undisturbed    serene    peaceful    tranquil    quiet    gentle    calm   

acid    antacid   

tranquil    peaceful    unruffled    gentle    bland    amiable    sunny    courteous    impassive    dreamy