unforeseen complication

[/ˌʌnfɔːrˈsiːn ˌkɒmplɪˈkeɪʃən/]
noun phrasefemininepl: unforeseen complications / complicações imprevistas
complicação imprevista
1. An unexpected difficulty or problem that arises and makes a situation more complex or troublesome than originally anticipated
The surgery went well until an unforeseen complication arose during recovery.
A cirurgia correu bem até que uma complicação imprevista surgisse durante a recuperação.
2. An unanticipated obstacle or setback that interferes with planned outcomes or timelines
Due to an unforeseen complication, the project deadline had to be extended by two weeks.
Devido a uma complicação imprevista, o prazo do projeto teve de ser prorrogado por duas semanas.
This phrase is commonly used in both Brazilian and American English in professional, medical, and project management contexts. In Brazil, it's frequently encountered in business discussions and healthcare settings. The Portuguese translation 'complicação imprevista' is standard across all Portuguese-speaking regions, though Brazilians may sometimes use the more colloquial 'dor de cabeça' (literally 'headache') to describe minor unforeseen complications in casual conversation.
NYC Slang
curveball / wrench in the works
Synonyms / Sinônimos
unexpected difficultyunanticipated problemunforeseen obstaclesurprise setbackunexpected hindrancecomplication não prevista
Antonyms / Antônimos
expected outcomeanticipated resultforeseen developmentplanned progression

Regional Variations

General Brazilian Portuguese
complicação imprevista
Standard and widely used across Brazil
São Paulo
complicação inesperada / complicação não prevista
Commonly used in business and professional contexts
Rio de Janeiro
complicação imprevista / dor de cabeça inesperada
May use colloquial 'dor de cabeça' (headache) metaphorically
Portugal
complicação imprevista / complicação inesperada
Both forms are acceptable; slightly more formal usage than Brazilian Portuguese

Related Words

complicationunforeseenobstacledifficultysetbackcontingencyproblema imprevistoobstáculo inesperado

Related Idioms & Phrases

a wrench in the works
a spanner in the works
throw a monkey wrench into something
um imprevisto surgiu
uma volta inesperada
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