sanguine

尽管面临挑战，他对公司未来的发展依然保持乐观。

Despite the challenges, he remains ___sanguine about the company's future.

即使球队的明星前锋撕裂了韧带，教练仍然保持乐观。

The coach remained ___sanguine even after the team's star forward tore his ligament.

她出人意料地对律师资格考试不及格保持乐观，深信下次一定能通过。

She was surprisingly ___sanguine about failing the bar exam, convinced she would pass the next time.