placidnessn.

1654 True & Impartial Rel. 3 [They] at last parted..with as much calmness and placidness, as if they had been to meet again anon safe and unhurt.

1682 J. Wilkins Serm. preached upon Several Occas. xiii. 419 Such an evenness and smoothness of disposition, as doth..add a sweetness and placidness to our carriage.

1747 S. Richardson Clarissa II. xl. 275 To enjoy yourself with your usual placidness, and not be ruffled.

1797 E. Malone Wks. Sir Joshua Reynolds I. p. lii Such was the placidness of his temper, that what he did not hear, he never troubled those with whom he conversed, to repeat.

1847 Ladies' Repository May 136/1 As he proceeded in his remarks and observations with great chasteness of style, a placidness gathered around every feature of his countenance, and animation lit up every expression of his piercing eyes.

1898 Daily News 15 Nov. 6/1 The British navvy at work amidst an armed camp..plied his vocation with placidness.

1935 Social Forces 13 354/1 The city is characterized by feverishness; the country is characterized by placidness.

1992 Today's Horse (BNC) Feb. 27 Pricked ears denote alertness, constantly twitching ones nervousness, relaxed ones placidness.