unexplained reason

[/ˌʌnɪkˈspleɪnd ˈriːzən/]
noun phrasepl: unexplained reasons
razão inexplicável / motivo inexplicado
1. A cause or explanation for something that cannot be clearly understood, justified, or accounted for
For some unexplained reason, the flight was cancelled without any notification.
Por uma razão inexplicável, o voo foi cancelado sem qualquer notificação.
2. A mysterious or unclear basis for an action, decision, or event
She left the party for unexplained reasons.
Ela deixou a festa por motivos não explicados.
This phrase is commonly used in both American and Brazilian English when describing bureaucratic failures, sudden decisions, or mysterious events. In Brazil, it is frequently used to express frustration with institutional lack of transparency. In the USA, it often appears in news reports and formal communications when authorities cannot provide clear explanations.
NYC Slang
no clear NYC slang equivalent; used as standard English
Synonyms / Sinônimos
unclear reasonmysterious reasonunknown reasoninexplicable causeundisclosed reason
Antonyms / Antônimos
clear reasonexplained reasonobvious causetransparent explanation

Regional Variations

General Brazilian
razão inexplicável / motivo inexplicado
Most common usage in everyday Brazilian Portuguese
Rio de Janeiro
razão inexplicável
Preferred in formal and informal contexts
São Paulo
motivo não explicado
Slightly more formal variant used in business contexts
Portugal
razão inexplicada / motivo sem explicação
European Portuguese tends to use 'inexplicada' more frequently

Related Words

mysteryobscureunclearenigmapuzzle

Related Idioms & Phrases

for reasons best known to oneself
without rhyme or reason
a mystery wrapped in an enigma
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