worried or annoyed about something; troubled in mind; to cause trouble or annoyance to someone.
From Irish 'bothair' meaning rude or rough, possibly entering English through Irish English speakers. The word evolved from describing rude behavior to describing being annoyed by something.
People often say 'I'm not bothered' when they mean they don't care, but the original Irish root meant 'rough' or 'rude'—showing how cultural attitude (don't be bothered by rudeness) became embedded in a single word's meaning.
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