This is a ludicrous situation.这种情形真是荒谬。

It's a completely ludicrous idea.这主意真是荒唐透顶。

This is a ludicrous claim.这个要求荒唐可笑。

It was ludicrous to suggest that the visit could be kept secret.认为此次访问能够保密真是可笑。

It is ludicrous that papers relating to the illness of George III should remain locked up.有关乔治三世病情的文件居然秘而不发实在是荒唐可笑。