undocumented reason
[ˌʌndɒkjuˈmɛntɪd ˈriːzən]
noun phrasepl: undocumented reasons
motivo não documentado
1. A reason or cause that has not been officially recorded, written down, or formally established in documentation
The system crashed for an undocumented reason that the developers could not explain.
O sistema travou por um motivo não documentado que os desenvolvedores não conseguiam explicar.
2. In software development, a feature or behavior that exists but lacks official explanation in technical documentation
This API endpoint behaves differently for undocumented reasons.
Este endpoint da API se comporta diferentemente por razões não documentadas.
3. A cause or explanation that has not been officially stated or made public
The project was cancelled for undocumented reasons.
O projeto foi cancelado por motivos não documentados.
This phrase is particularly common in technology and software development communities in both Brazil and the USA, where it often refers to bugs or behaviors that lack proper documentation. In Brazilian corporate culture, citing an 'undocumented reason' is sometimes used euphemistically to avoid taking responsibility or providing a clear explanation.
NYC Slang
no cap reason / mystery reason (informal slang equivalent in NYC tech circles)
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