Definition: nastiest

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Source: Webster's Revised Unabridged Dictionary (1913) 

Nasty \Nas"ty\, a. [Compar. Nastier; superl. Nastiest.] [For
   older nasky; cf. dial. Sw. naskug, nasket.]
   1. Offensively filthy; very dirty, foul, or defiled;
      disgusting; nauseous.

   2. Hence, loosely: Offensive; disagreeable; unpropitious;
      wet; drizzling; as, a nasty rain, day, sky.

   3. Characterized by obcenity; indecent; indelicate; gross;
      filthy.

   Syn: Nasty, Filthy, Foul, Dirty.

   Usage: Anything nasty is usually wet or damp as well as
          filthy or dirty, and disgusts by its stickness or
          odor; but filthy and foul imply that a thing is filled
          or covered with offensive matter, while dirty
          describes it as defiled or sullied with dirt of any
          kind; as, filthy clothing, foul vapors, etc.