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Covered in goo, perhaps, 5 letters
Covered with thick, icky liquid, 5 letters
Covered with viscous mud, 5 letters
Disgustingly dishonest, 5 letters
Hard to hold, in a way, 5 letters
Like a slug's trail, 5 letters
Like snails' trails, 5 letters
Like snakes, in many people's imaginations (but not really), 5 letters
Morally reprehensible, 5 letters