R. Kelly was so "overwhelmed" with his legal woes, he had no idea what the hell he was reading after he was served papers while in jail ... much less know how to handle it in court and that's why he lost his sexual abuse case ... so claims his lawyer who is fighting to undo the legal defeat.
Somehow, Williams served Kelly while he was in jail for failing to pay child support ... this according to Kelly's civil attorney, Brian Nix, who tells TMZ ... "R. Kelly was served while incarcerated on the child support case and he was overwhelmed by the experience of being in jail." When Kelly failed to appear for a hearing, Williams won a default judgment against the singer.
Nix says, "[Being overwhelmed] coupled with Mr. Kelly not being cognizant of what the motion fully meant led to him missing the hearing. I had no idea he had been served." There's a hearing set for next month to determine damages.