·superl Characterized by obcenity; indecent; indelicate; gross; filthy.
II. Nasty ·superl Offensively filthy; very dirty, foul, or defiled; disgusting; nauseous.
III. Nasty ·superl Hence, loosely: Offensive; disagreeable; unpropitious; wet; drizzling; as, a nasty rain, day, sky.