lightweight

夏天我喜欢穿轻便的衣服，因为它们更透气舒适。

In summer, I prefer wearing ___lightweight because they're more breathable and comfortable.

这位拳击手在轻量级比赛中表现出色。

The boxer performed exceptionally well in the ___lightweight category.

这场辩论被认为太过肤浅，缺乏实质性内容。

The debate was dismissed as too ___lightweight to address the real issues.