In rough
Definition 1 of 2
Pro Tip 1/3Unpolished Nature
Refers to something that needs more work to be complete or refined. 
He outlined his theory in rough, ready to polish it later.
Pro Tip 2/3Not Final
Emphasizes that current state isn't the end product, open to changes. 
The design is still in rough; we will add details soon.
Pro Tip 3/3Creative Process
Often used when discussing early stages of creative work. 
She sketched her portrait in rough before final touches.