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  1. not constant; changeable; fickle; variable: an inconstant friend.
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Origin of inconstant

1375–1425; late Middle English inconstaunt < Latin inconstant- (stem of inconstāns) changeable. See in-3, constant
Related formsin·con·stan·cy, nounin·con·stant·ly, adverb

Synonyms for inconstant

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Antonyms for inconstant

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for inconstancy

treachery, affair, betrayal, duplicity, adultery, nervousness, anxiety, agitation, insomnia, disquiet, jitters, uneasiness, ferment, instability, whim, quirk, flaw, vulnerability, lapse, lack

Examples from the Web for inconstancy

Historical Examples of inconstancy

  • It was not long before they had to pay a heavy penalty for their treachery and inconstancy.

    Stories from Thucydides

    H. L. Havell

  • But it is necessary for me, for my honor, to prevent the scandal of her inconstancy.

  • Her flightiness or inconstancy was of the most dangerous kind.

  • He was tired of her, and yet he seems to have been ashamed to confess his inconstancy.

    Mary Wollstonecraft

    Elizabeth Robins Pennell

  • Others are ceramic satires on the drunkard's folly or the inconstancy of women.

British Dictionary definitions for inconstancy


  1. not constant; variable
  2. fickle
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Derived Formsinconstancy, nouninconstantly, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for inconstancy


1520s, from Latin inconstantia (see inconstance).

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c.1400, "fickle, not steadfast," from Middle French inconstant (late 14c.), from Latin inconstantem (nominative inconstans) "changeable, fickle, capricious," from in- "not, opposite of, without" (see in- (1)) + constantem (see constant). Related: Inconstantly.

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Online Etymology Dictionary, © 2010 Douglas Harper

inconstancy in Medicine


  1. Changing or varying, especially often and without discernible pattern or reason.
  2. Relating to a structure that normally may or may not be present.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.