imperturbationn.
/ɪmˌpəːtəˈbeɪʃn/, U.S. /ᵻmˌpərdərˈbeɪʃ(ə)n/ Now somewhat rare.
Freedom from being mentally perturbed or agitated; calmness, unexcitability.
ΘΚΠ
the mind > emotion > calmness > [noun]
resteOE
peacea1225
egalityc1374
tranquillityc1374
peaceabilityc1384
sobernessc1384
tranquille1412
quietness?a1425
evenheadc1440
equalitya1475
equability1531
sobermood1556
calmness1561
evenness1561
serenity1599
collection1602
equilibrium1608
calm1609
temperateness1609
composedness1611
recollection1611
temper1611
unpassionateness1611
placidity1619
sereneness1628
attemperature1635
quietationa1639
equableness1641
steadiness1642
sedateness1647
imperturbation1648
placidness1654
centredness1662
equanimity1663
composure1667
serenitude1672
equalness1675
unperturbedness1676
dispassion1690
quietism1735
serene1744
relaxednessa1750
self-composure1762
sober-mindedness1767
collectedness1789
unprovokedness1795
comfortableness1815
repose1815
levelness1824
dispassionateness1842
unruffledness1858
passionlessness1867
1648 W. Montagu Miscellanea Spiritualia i. xix. §2 In our copying of this equality and imperturbation, we must profess with the Apostle, We have not received the Spirit of the World, but the Spirit which is of God.
a1695 H. Wharton One & Twenty Serm. preach'd Lambeth Chapel (1698) v. 116 To propose the acquisition of a compleat Knowledge of all things in this Life, of an absolute imperturbation of Mind, and constant Infallibility, is no less Vain.
1828 Literary Focus Mar. 180/2 Must we shut up every fountain of feeling, and with excess of imperturbation be alike unmoved by joy or wo?
1871 ‘M. Legrand’ Cambr. Freshman ii. 16 Collectedness of faculties, and imperturbation of feature.
2007 Soc. & Econ. 29 162 This is not aversion but developing the ability to face passion and inevitable change with calmness and imperturbation.
This entry has been updated (OED Third Edition, June 2019; most recently modified version published online March 2022).
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