logical inconsistency
Argument defeats itself
A logical inconsistency occurs when two or more statements cannot all be true at the same time—they contradict each other.
Someone who claims to value honesty but routinely lies demonstrates a logical inconsistency between stated beliefs and behavior.
In formal reasoning, a logical inconsistency invalidates an argument: The witness's testimony contained several logical inconsistencies that undermined her credibility.
- contradictionOpposing claims, incompatible together
- paradoxSeemingly absurd truth
- square circleSelf-negating geometric concept
- fallacyError in reasoning
- circular reasoningFallacy assuming its conclusion
flaw · fatal flaw · error · absurdity · conflicting · incoherent · self-defeating · apples and oranges · disconnect · hole · gap · crack · unraveling · tangled · muddle · doublethink · having it both ways · hypocrisy
logical inconsistencylogical consistency
Freedom from self-contradiction
consistency · coherence · self-consistency · non-contradiction · congruence
logical inconsistencysoundness
Reliability of structure
validity · cogency · rigor · rationality · reasonableness
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