陈旧 chénjiù old-fashioned
old-fashioned; out of date; obsolete; antiquated
How to remember 陈旧: 陈 to display + 旧 old = old-fashioned.
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How it is used
- Old and outdated - worn, dated, no longer current - 观念陈旧 (guānniàn chénjiù) outdated ideas; 设备陈旧 aging equipment.
- Negative: implies staleness and obsolescence, both for objects and for thinking/methods.
- Contrast 古老 (gǔlǎo, ancient - often respectful) and neutral 旧 (jiù, simply old/used); 陈旧 adds 'behind the times'.