1.不可开交:covered in;flooded with;drowned in.
I'm absolutely covered in housework. This place is filthy.
2.不可收拾: spin out of control.
Wildly spending can make your finances spin out of control.
3.不伦不类:mismatched,mixing apples and oranges.
He looks ridiculous in his mismatched clothing.
4.不瞒你说:to tell you the truth.
To tell you the truth,I am only eighteen years old.
5.不能自拔:unable to give up;in the grips of.
He has been in the grips of alcohol and drugs.
6.不起眼:run of the mill.
His documentary was informative but unoriginal;it was really pretty run out of the mill.
7.不三不四:dubious,questionable.
Having friends of dubious character invites troubles.
If you lie down with dogs,you get up with fleas.
If you show me your friends,I can show you your future.
8.施舍救济:handouts.
He's been surviving on handouts since he got fired.