Old-fashioned, stale, or antiquated; something that feels outdated or trite.
そのデザインは古臭くて買いたくない。
That design looks old-fashioned and I don't want to buy it.
彼のジョークは古臭くて誰も笑わなかった。
His joke was stale and nobody laughed.
古臭い家具をアンティークとして飾る人もいる。
Some people decorate with old-looking furniture as antiques.