• WordNet 3.6
    • 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
    • unperturbed Not perturbed; not affected by or exhibiting perturbation, in any sense.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Unperturbed un-per-turbd′ not perturbed
    • ***


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

In poetry:

The unperturbed soft moon, the stars,
The breeze that lingers,
Wake not to ineffectual wars
Their hearts and fingers.
"Happy Death" by John Freeman
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.
"The True Beatitude (Bouts-Rimes)" by Rupert Brooke

In news:

With no charge and practically no mass, high-energy neutrinos pass unperturbed through interstellar magnetic fields.
South Korean voters unperturbed by North's impending rocket launch.
After 'average' year, Stills unperturbed by criticism: 'Put it all on me, I really don't care'.
Letterman's Sponsors Appear to Be Unperturbed .

In science:

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