inconsistent

[in-kuhn-sis-tuhnt]
adjective
1.
lacking in harmony between the different parts or elements; self-contradictory: an inconsistent story.
2.
lacking agreement, as one thing with another or two or more things in relation to each other; at variance: a summary that is inconsistent with the previously stated facts.
3.
not consistent in principles, conduct, etc.: He's so inconsistent we never know if he'll be kind or cruel.
4.
acting at variance with professed principles.
5.
Logic. incompatible ( def 4b ).

Origin:
1640–50; in-3 + consistent

inconsistently, adverb

incontinent, inconsistent (see synonym study at the current entry).


1. incoherent. 2. discrepant, disagreeing, irreconcilable. Inconsistent, incompatible, incongruous refer to things that are out of keeping with each other. That which is inconsistent involves variance, discrepancy, or even contradiction, especially from the point of view of truth, reason, or logic: His actions are inconsistent with his statements. Incompatible implies incapability of close association or harmonious relationship, as from differences of nature, character, temperament, and the like: actions incompatible with honesty of purpose; qualities that make two people incompatible. Something that is incongruous is inappropriate or out of keeping, often to the point of being ridiculous or absurd: Incongruous characters or situations frequently provide a basis for comedy.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
inconsistent (ˌɪnkənˈsɪstənt)
 
adj
1.  lacking in consistency, agreement, or compatibility; at variance
2.  containing contradictory elements
3.  irregular or fickle in behaviour or mood
4.  maths Also: incompatible (of two or more equations) not having one common set of values of the variables: x + 2y = 5 and x + 2y = 6 are inconsistent
5.  logic (of a set of propositions) enabling an explicit contradiction to be validly derived
 
incon'sistently
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

inconsistent
1646, "not agreeing in substance or form," from in- "not" + consistent (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
We're not easily swayed, overly emotional, or wildly inconsistent.
Similarly, the growth is inconsistent with the contribution of fiscal stimulus
  which has turned negative lately.
Winds were both dangerously high and maddeningly inconsistent.
Again, the answer is complicated by the inconsistent quality of the available
  information.
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