inconsistent

[in-kuhn-sis-tuhnt]

adjective

1. lacking in harmony between the different parts or elements; self-contradictory.

   an inconsistent story.

   Synonyms: incoherent

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.

   Synonyms: irreconcilable, discrepant

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.

inconsistent

/ ˌɪnkənˈsɪstənt /

adjective

1. lacking in consistency, agreement, or compatibility; at variance

2. containing contradictory elements

3. irregular or fickle in behaviour or mood

4. Also: incompatible. maths (of two or more equations) not having one common set of values of the variables: x + 2 y = 5 and x + 2 y = 6 are inconsistent

5. logic (of a set of propositions) enabling an explicit contradiction to be validly derived

Other Word Forms

• inconsistently adverb

Word History and Origins

Origin of inconsistent¹

First recorded in 1640–50; in- ³ + consistent

Synonym Study

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.

Example Sentences

The proposal is inconsistent with the school’s belief that scientific funding should be based on scientific merit alone, she said.

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The current strategy of defending the peso is inconsistent with the president’s campaign promises and more expensive than the alternative.

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But can they defend their Super Bowl title if their passing attack remains so inconsistent?

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His production could be inconsistent, with dominant displays one week and quiet showings the next.

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After coming to America loaded with hype, he was inconsistent through eight early starts and then went down with a shoulder injury.

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Related Words

• conflicting 
• contrary 
• erratic 
• illogical 
• incompatible 
• irreconcilable 
• uncertain 
• unpredictable