A room with papers and clothes and dirty dishes spread all around is an example of something that would be described as sloppy.
Jotting down quick answers to your homework that are written so messily the teacher can barely read them is an example of something that would be described as a sloppy effort.
A sloppy room; a sloppy roommate.
Sloppy use of language; a sloppy researcher.
A sloppy love letter.
A sloppy stew.
Origin of sloppy
- From slop, + -y suffix.