A slow, dumb, lazy, unmotivated, uncaring, incompetent, unnecessary and replaceable human. Someone who's laziness of mind is manifested in both their physical form and the way they behave.
I had to step off the curb and walk on the street to get past the slothenly family strolling down the sidewalk. It took the slothenly employees 25 minutes to prepare my to go order at lunch. I tried to walk up the escalator, but the slothenly people prevented my progress