社交媒体上充斥着大量无脑跟风的内容。

Social media is flooded with the ___mindlessness of bandwagon trends.

他在看电视时处于一种完全心不在焉的状态，连节目内容都没记住。

He watched TV in complete ___mindlessness, not even remembering the show's content.

他因为玩手机时的鲁莽行为撞上了路标。

He hit the road sign due to his ___mindlessness while playing with his phone.