Be no picnic
Definition 1 of 1
Pro Tip 1/3Negative Connotation
Expresses that something is unpleasant or hard without being insulting. 
Being stuck in traffic for hours is no picnic.
Pro Tip 2/3Common Usage
Often used to describe tasks, situations, or life experiences that are challenging. 
Raising three kids alone is no picnic.
Pro Tip 3/3Emotional Weight
May carry a tone of sympathy, understanding, or commiseration when used. 
I know dealing with loss is no picnic.