Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Lack of interest; indifference.
  • n. Lack of worry or apprehensiveness.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. indifference or lack of concern.

from the GNU version of the Collaborative International Dictionary of English

  • n. Want of concern; absence of anxiety; freedom from solicitude; indifference.

from The Century Dictionary and Cyclopedia

  • n. Want of concern; absence of anxiety; freedom from solicitude; indifferentism; indifference; apathy.
  • n. Synonyms Indifference, Insensibility, etc. See apathy.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a feeling of lack of concern
  • n. the trait of remaining calm and seeming not to care; a casual lack of concern

Etymologies

Probably back-formation from unconcerned.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

  • Ignore it deliberately, as a kitten stalks away with feigned unconcern from a suddenly tedious cotton-reel, in the hope that, seen afresh from the other side of the room, it will turn once more into a mouse.

    Try Anything Twice

  • That evidence of their essential "unconcern" was established by interviews and reported in Alice Kimball Smith's A Peril and a Hope: The Scientists 'Movement in America, 1945-1947 (MIT Press, 1970, pp. 60-61.)

    Science and Society: An Exchange

  • Kevles's history almost entirely ignores both the "unconcern" of the majority and the "concern" of the minority.

    Science and Society: An Exchange

  • This time he tried the one that folks call "unconcern," a look as if he had no troubles at all, as if he had nothing to hide.

    Seven O'Clock Stories

  • "It bears the marks of that superb unconcern which is the characteristic of genius," replied the Ambitious Writer, contemptuously passing him by.

    Fantastic Fables

  • Whenever women turn up in the stories, a rancorous tone intrudes that is badly at odds with his characters' merry unconcern.

    Tales of Jaunty Anarchy on the Nile

  • Donning an unadorned and boyish wardrobe that itself did not "weigh heavily," she fashioned renunciation into a contrary look of simplicity, ineffability, transcendent unconcern her competitor Paul Poiret called it "poverty deluxe".

    The Enduring Coco Chanel

  • The raven pretended unconcern and stretched his wings.

    Bird Cloud

  • "Yes, Captain," he said, with the same quiet unconcern with which he would have accepted an invitation to dinner; "I'll go with you to Mangareva."

    THE SEED OF McCOY

  • "I gotcha ... sir," came the reply, insolent in its very softness and unconcern.

    CHAPTER V

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