大学英语系的进啊～

THis isn't challenging at all!!!!/

you can also say..this is too easy..it's not challenging at all!!!!

It is by no means challenging.这个比较正式

with no challenge
not challenging

Shut up all of you!!!

It's a piece of cake !常用于美国口语,就是很容易没有挑战性

It is without any challenge!