circular logic

[SUR-kyuh-ler LAH-jik]
noun
lógica circular
1. A logical fallacy in which the conclusion of an argument is used as a premise, creating a self-reinforcing but ultimately unproven statement
The argument that 'God exists because the Bible says so, and the Bible is true because God wrote it' is an example of circular logic.
O argumento de que 'Deus existe porque a Bíblia diz assim, e a Bíblia é verdadeira porque Deus a escreveu' é um exemplo de lógica circular.
2. Reasoning that returns to its starting point without providing independent proof or establishing truth
Using circular logic to justify a policy is intellectually dishonest and unconvincing.
Usar lógica circular para justificar uma política é intelectualmente desonesto e não convincente.
Circular logic is frequently criticized in both American and Brazilian academic discourse. In Brazil, the term is particularly used in philosophical debates, journalism, and political discussions to expose weak argumentation. In the US, it's a common rhetorical critique in law, debate competitions, and media analysis. Both cultures value linear, evidence-based reasoning and view circular logic as a mark of poor argumentation or intellectual dishonesty.
NYC Slang
going in circles; talking in circles
Synonyms / Sinônimos
begging the questionpetitio principiicircular reasoningtautological fallacyvicious circle
Antonyms / Antônimos
linear logicsound reasoningvalid argumentlogical consistency

Regional Variations

General Brazilian
lógica circular
Standard usage in academic and formal contexts
São Paulo
lógica circular / raciocínio circular
Both terms used interchangeably in business and academic discourse
Rio de Janeiro
lógica circular
Used in intellectual discussions and debates
Portugal
lógica circular / raciocínio circular
Preferred in academic philosophy and formal writing

Related Words

fallacypremiseconclusionlogical fallacyargumentationdeductive reasoning

Related Idioms & Phrases

going around in circles
chasing your own tail
round and round we go
a vicious circle
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