迂 (yū) means 'roundabout / detoured' and 腐 (fǔ) means 'rotten/stale' - together: someone whose thinking takes long winding paths through stale ideas. The classic image is a Confucian scholar quoting books at problems that need common sense.
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迂腐 is mildly negative - fine in conversation about a colleague or fictional character, but somewhat insulting if used to someone's face.
