“不靠谱”怎么翻译？

字面意思直译是：far away from what is normal，go beyond what is proper,.
但实际翻译要根据上下文。
for instance:
I can enjoy a joke as well as the next man, but this is going too far.
我跟别人一样喜欢开玩笑,但这个玩笑太离谱了/太不靠谱了。