这些评论是刻薄的，带有灼烧般的尖锐。

The remarks are ___caustic, burning in their intensity.

处理这些腐蚀性清洁剂时要戴上手套。

Wear gloves when handling these ___caustic cleaners.

他对同事的失败发表了刻薄的评论。

He made a ___caustic remark about his colleague's failure.