Source : Webster's Revised Unabridged Dictionary (1913)

Soapy \Soap"y\, a. [Compar. {Soapier}; superl. {Soapiest}.]
   1. Resembling soap; having the qualities of, or feeling like,
      soap; soft and smooth.

   2. Smeared with soap; covered with soap.

Source : WordNet®

soapy
     adj : having the qualities of soap (and liable to slip away) [syn:
            {saponaceous}]
     [also: {soapiest}, {soapier}]