Definitions

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

  • transitive v. To upset the self-possession of; ruffle. See Synonyms at embarrass.
  • transitive v. To frustrate (plans, for example) by throwing into disorder; disarrange.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To upset the composure of
  • v. To bring into confusion
  • v. To frustrate, make go wrong

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To break up the harmonious progress of; to throw into disorder or confusion.
  • transitive v. To confuse the faculties of; to disturb the composure of; to discompose; to abash.
  • n. Want of concert; disagreement.

from The Century Dictionary and Cyclopedia

  • To throw into disorder or confusion; come in the way of; disarrange; obstruct.
  • To unsettle the mind of; discompose; disturb the self-possession of; confuse.
  • Synonyms To ruffle. See list under discompose.
  • n. Disunion; disagreement; disconcertment.

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

  • v. cause to lose one's composure
  • v. cause to feel embarrassment

Etymologies

Obsolete French disconcerter, from Old French desconcerter : des-, dis- + concerter, to bring into agreement (from Old Italian concertare; see concert).
(American Heritage® Dictionary of the English Language, Fourth Edition)
From French disconcerter, an alteration of Middle French desconcerter, itself from des- 'dis' (from Middle French dis-)+ concerter 'to bring into agreement, organize' (Wiktionary)

Examples

  • Some of our findings will irk the deeply religious reader, while others will disconcert the deeply secular.

    American Grace

  • See Hot Air for more, including a link to the actual language and a reminder that the Democrats never had any intention of doing anything at all to disconcert trial lawyers.

    Nancy Pelosi’s non-tort reform. - Moe_Lane’s blog - RedState

  • My sounds seemed momentarily to disconcert the boar, and while he halted and shifted his weight with indecision, an apparition burst upon us.

    CHAPTER III

  • A rock, turning under his foot on the edge of the precipice, did not disconcert him.

    All Gold Cañon

  • And, besides, it's such good fun to see how one virtuous man can so disconcert you captains of industry and arbiters of destiny.

    THEFT

  • • Changes at News International, where James Murdoch, discombobulated perhaps by the phone-hacking revelations, devises new ways to disconcert his underlings.

    Hugh Muir's Diary

  • Its emotional depths may disconcert some of his huge fan base, but also give them unexpected pleasure.

    La's Orchestra Saves the World by Alexander McCall Smith: Book summary

  • How To Dress well hit the bulls-eye when he turned Ready For The World's "Love You Down" into an ethereal haze of mutant beats and chilling vocal samples that will make your cat stand up in disconcert.

    Joshua Glazer: 10 New Music Artists To Watch This Autumn

  • It may disconcert the prevailing image of Jefferson the empiricist to observe that he also devoted his life to a religious project.

    The Chosen Peoples

  • Perhaps he had simply made that remark to disconcert me?

    Storyteller

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