近义词是rigorous，例如：

1、Guests without invitations have to undergo rigorous safety checks.没有邀请函的客人要接受严格的安全检查。

2、Was it a curriculum that appeared more rigorous， perhaps?或许是一门看似更为严格的课程?

3、The work failed to meet their rigorous standards.工作没有达到他们的严格标准。