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Fine Dictionary

unperturbed

ˌənpərˈtərbd
WordNet
A soldier walks on the street unperturbed through the rain.
A soldier walks on the street unperturbed through the rain.
  1. (adj) unperturbed
    free from emotional agitation or nervous tension "the waiters were unflurried and good natured","with contented mind and unruffled spirit"- Anthony Trollope"
Century Dictionary and Cyclopedia
  1. unperturbed
    Not perturbed; not affected by or exhibiting perturbation, in any sense.
Chambers's Twentieth Century Dictionary
  1. (adj) Unperturbed
    un-per-turbd′ not perturbed
Usage in the news

With no charge and practically no mass, high-energy neutrinos pass unperturbed through interstellar magnetic fields. economist.com

South Korean voters unperturbed by North's impending rocket launch. globalpost.com

After 'average' year, Stills unperturbed by criticism: 'Put it all on me, I really don't care'. tulsaworld.com

Letterman's Sponsors Appear to Be Unperturbed . nytimes.com

TOKYO EXCHANGE REBOUNDS, UNPERTURBED BY WALL STREET. nytimes.com

Usage in scientific papers

In it was proved that, if unperturbed system is described by random matrix theory, the distribution of new eigenvalues will also be of random matrix type.
Singular statistics

Unperturbed eigenvalues have multiplicity 4 (for non-zero m, n) due to the existence of positive and negative values of m, n.
Singular statistics

The fact that the unperturbed homoclinic orbit, obtained via a Darboux transformation, is a classical solution, leads to the conclusion that only local well-posedness is necessary for a Melnikov measurement.
Melnikov Analysis for Singularly Perturbed DSII Equation

The Melnikov measurement is built upon an unperturbed homoclinic orbit of the unperturbed DSII.
Melnikov Analysis for Singularly Perturbed DSII Equation

An explicit expression of the unperturbed homoclinic orbit, (2).
Melnikov Analysis for Singularly Perturbed DSII Equation

Usage in literature

Mrs Elliott followed, unperturbed. "The Lady of the Basement Flat" by Mrs. George de Horne Vaizey

Unperturbed, it went on rising. "Unwise Child" by Gordon Randall Garrett

His face, as well as his voice, was unperturbed. "The Return of Peter Grimm" by David Belasco

On Jon's right sat the colonel, looking cool, unperturbed, and very gentle. "The Unnecessary Man" by Gordon Randall Garrett

The smile was fixed in astonishment; Rina was unperturbed. "Two on the Trail" by Hulbert Footner

What he saw was some sort of an animal that, unperturbed by the light, was advancing slowly. "The Ranger Boys and the Border Smugglers" by Claude A. Labelle

McLeod, however, was unperturbed. "Billy Topsail & Company" by Norman Duncan

Mary Cox walked unperturbed to the teacher and Tom and put out her hand to the youth, thanking him very nicely for what he had done. "Ruth Fielding at Briarwood Hall" by Alice B. Emerson

Jim stood looking silently at the corpse on the ground, his face peculiarly unperturbed. "The Spoilers of the Valley" by Robert Watson

Their lips were moving, their faces unperturbed. "Life Sentence" by James McConnell

Usage in poetry
The unperturbed soft moon, the stars,
The breeze that lingers,
Wake not to ineffectual wars
Their hearts and fingers.
New sulphur on the sin-incarnadined . . .
Ah, Love! still temporal, and still atmospheric,
Teleologically unperturbed,
We share a peace by no divine divined,
An earthly garden hidden from any cleric,
Untrodden of God, by no Eternal curbed.