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

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Historical Examples of inconstancy

British Dictionary definitions for inconstancy


  1. not constant; variable
  2. fickle
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).



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.

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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.