unperturbedadj.

Brit.

/(ˌ)ʌnpəˈtəːbd/, U.S.

/ˌənpərˈtərbd/

Forms: see un- prefix¹ and perturbed adj.

Origin: Formed within English, by derivation. Etymons: un- prefix¹, perturb v., -ed suffix¹.

Etymology: < un- prefix¹ + perturb v. + -ed suffix¹. Compare later perturbed adj.

1. Not perturbed; untroubled, undisturbed.

ΘΚΠ

the mind > emotion > calmness > [adjective]

eveneOE

still1340

unperturbeda1450

unmovedc1480

quietful1494

lowna1500

calma1568

calmya1586

unpassionatea1586

smartless1593

reposeful1594

dispassionate1595

recollected1595

unaffectedc1595

unpassioned?1605

unpassionated1611

collecteda1616

tranquila1616

untouched1616

impassionate1621

composed1628

dispassioneda1631

tranquillous1638

slow1639

serene1640

dispassionated1647

imperturbed1652

unruffled1654

reposing1655

equanimous1656

perplacid1660

placate1662

equal1680

collect1682

cooled1682

posed1693

sedate1693

impassive1699

uninflamed1714

unexcited1735

unalarmed1756

unfanned1764

unagitated1772

undistraught1773

recollected1792

equable1796

unfussy1823

take-it-easy1825

unflurried1854

cool1855

comfortable1856

disimpassioned1860

tremorless1869

unpressured1879

unrippled1883

ice-cool1891

unrattled1891

Zen-likea1908

unrestless1919

steadyish1924

ataractic1941

relaxed1958

nonplussed1960

loose1968

Zenned-out1968

downtempo1972

mellowed1977

de-stressed1999

a1450 (?c1421) J. Lydgate Siege Thebes (Arun.) (1911) l. 1714 That he..Myght allone regnen in quiete;..Vnperturbed of Polymyte his brother.

1611 R. Cotgrave Dict. French & Eng. Tongues Impassible,..vnpassionate, vnperturbed.

1671 R. McWard True Non-conformist 389 What in the ordinary and unperturbed condition of things would be accounted..an usurpation.

1795 Oracle & Public Advertiser 9 July A tone of steady and unperturbed confidence.

1823 W. Scott Quentin Durward III. iii. 58 The King..unperturbed by the..violent gestures of the Duke.

1876 ‘G. Eliot’ Daniel Deronda I. i. vi. 99 His own love seemed a guarantee of hers, since it was one with the unperturbed delight in her image.

1940 T. Wolfe & E. C. Aswell You can't go Home Again v. 48 The voice of time remained aloof and unperturbed.

2002 Pop. Sci. Jan. 45 (caption) When unperturbed, the mimic octopus is an inconspicuous brown mollusk.

†a. Of light: unaltered by intervening matter, pure. Obsolete.

ΚΠ

1674 R. Boyle Excellency Theol. ii. iii. 150 The great plenty of unperturbed light that is reflected from snow.

1865 J. Stock Expos. First Epist. Gen. St. John i. 22 The planets reflect the light of the sun and beam forth with unperturbed light.

b. Science. Not subject to or affected by a perturbation (perturbation n. 4), free of any perturbation.

ΘΚΠ

the world > matter > physics > quantum theory > raising energy level, excitation > [adjective] > not disturbed

unperturbed1790

1790 Monthly Rev. Aug. 535 Daniel Bernoulli..deduced them from his theory of the co-existence of simple vibrations unperturbed in the compound system.

1894 Amer. Jrnl. Sci. 148 110 The radius vector of an unperturbed planet sweeps over equal areas in equal times.

1937 E. C. Kemble Fund. Princ. Quantum Mech. xi. 380 We designate the problems based on the two operators H₀ and H as the unperturbed and the perturbed problems, respectively.

2011 Proc. National Acad. Sci. U.S.A. 108 15634/2 Unperturbed solutions converge to the fixed point.

This entry has been updated (OED Third Edition, December 2014; most recently modified version published online December 2021).

单词	unperturbed
释义	unperturbedadj. Brit. /(ˌ)ʌnpəˈtəːbd/, U.S. /ˌənpərˈtərbd/ Forms: see un- prefix¹ and perturbed adj. Origin: Formed within English, by derivation. Etymons: un- prefix¹, perturb v., -ed suffix¹. Etymology: < un- prefix¹ + perturb v. + -ed suffix¹. Compare later perturbed adj. 1. Not perturbed; untroubled, undisturbed. ΘΚΠ the mind > emotion > calmness > [adjective] eveneOE still1340 unperturbeda1450 unmovedc1480 quietful1494 lowna1500 calma1568 calmya1586 unpassionatea1586 smartless1593 reposeful1594 dispassionate1595 recollected1595 unaffectedc1595 unpassioned?1605 unpassionated1611 collecteda1616 tranquila1616 untouched1616 impassionate1621 composed1628 dispassioneda1631 tranquillous1638 slow1639 serene1640 dispassionated1647 imperturbed1652 unruffled1654 reposing1655 equanimous1656 perplacid1660 placate1662 equal1680 collect1682 cooled1682 posed1693 sedate1693 impassive1699 uninflamed1714 unexcited1735 unalarmed1756 unfanned1764 unagitated1772 undistraught1773 recollected1792 equable1796 unfussy1823 take-it-easy1825 unflurried1854 cool1855 comfortable1856 disimpassioned1860 tremorless1869 unpressured1879 unrippled1883 ice-cool1891 unrattled1891 Zen-likea1908 unrestless1919 steadyish1924 ataractic1941 relaxed1958 nonplussed1960 loose1968 Zenned-out1968 downtempo1972 mellowed1977 de-stressed1999 a1450 (?c1421) J. Lydgate Siege Thebes (Arun.) (1911) l. 1714 That he..Myght allone regnen in quiete;..Vnperturbed of Polymyte his brother. 1611 R. Cotgrave Dict. French & Eng. Tongues Impassible,..vnpassionate, vnperturbed. 1671 R. McWard True Non-conformist 389 What in the ordinary and unperturbed condition of things would be accounted..an usurpation. 1795 Oracle & Public Advertiser 9 July A tone of steady and unperturbed confidence. 1823 W. Scott Quentin Durward III. iii. 58 The King..unperturbed by the..violent gestures of the Duke. 1876 ‘G. Eliot’ Daniel Deronda I. i. vi. 99 His own love seemed a guarantee of hers, since it was one with the unperturbed delight in her image. 1940 T. Wolfe & E. C. Aswell You can't go Home Again v. 48 The voice of time remained aloof and unperturbed. 2002 Pop. Sci. Jan. 45 (caption) When unperturbed, the mimic octopus is an inconspicuous brown mollusk. 2. †a. Of light: unaltered by intervening matter, pure. Obsolete. ΚΠ 1674 R. Boyle Excellency Theol. ii. iii. 150 The great plenty of unperturbed light that is reflected from snow. 1865 J. Stock Expos. First Epist. Gen. St. John i. 22 The planets reflect the light of the sun and beam forth with unperturbed light. b. Science. Not subject to or affected by a perturbation (perturbation n. 4), free of any perturbation. ΘΚΠ the world > matter > physics > quantum theory > raising energy level, excitation > [adjective] > not disturbed unperturbed1790 1790 Monthly Rev. Aug. 535 Daniel Bernoulli..deduced them from his theory of the co-existence of simple vibrations unperturbed in the compound system. 1894 Amer. Jrnl. Sci. 148 110 The radius vector of an unperturbed planet sweeps over equal areas in equal times. 1937 E. C. Kemble Fund. Princ. Quantum Mech. xi. 380 We designate the problems based on the two operators H₀ and H as the unperturbed and the perturbed problems, respectively. 2011 Proc. National Acad. Sci. U.S.A. 108 15634/2 Unperturbed solutions converge to the fixed point. This entry has been updated (OED Third Edition, December 2014; most recently modified version published online December 2021). < adj.a1450
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