1) The rank-brained decision to ignore safety guidelines led to a serious accident.

2) His rank-brained idea of quitting his stable job without a backup plan backfired.

3) I can't believe she made such a rank-brained purchase without checking the reviews first.

4) It was a rank-brained move to trust a stranger with such sensitive information.

5) Their rank-brained scheme to get rich quick proved to be a total failure.

6) The company suffered major losses due to the rank-brained investments made by the CEO.

7) I warned him that it was a rank-brained idea to drive without a valid license, but he didn't listen.

8) The rank-brained strategy to cut costs by mistreating employees led to a high turnover rate.

9) The team's rank-brained approach to solving the problem only made matters worse.

10) The teacher thought the student's rank-brained excuse for not handing in the assignment was laughable.

11) I'm sorry, but "Rank-Brained" is not a common English word and does not have any example sentences.