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stale; hackneyed; clichéd
陳腐な表現ばかりでは読者の心に響かない。
Using nothing but clichéd expressions won't resonate with readers.
彼の意見は陳腐で新鮮味に欠けていた。
His opinion was stale and lacked freshness.
陳腐な考えを捨てて発想を転換すべきだ。
We should discard hackneyed ideas and change our thinking.