jujube,
The word 'discomfortable' exists. It is listed as archaic in American dictionaries, but in the Oxford 2nd Edition it means pretty much the same as 'uncomfortable' with the possible stronger nuance of "positively uncomfortable" or "comfortless".
Unfortunately, the Oxford only gives quotations from the late 19th century, but a quick check of the internet turned up the following sentences.
If you are discomfortable with your sleeping postures, use a whole body pillow or pregnancy pillow to support your growing abdomen.
When I exercise with any weights over my shoulders, my left shoulder will feel discomfortable or will come out of place again.
Playing 3d games with a 4 directional d-pad sometimes can be discomfortable.
-So, the word is still in use. I like it and I think I'll start using it.... :) Thanks jujube.