Synonyms for Soapy (same or very similar meaning)
WordNet sense 1 (resembling or having the qualities of soap):
saponaceousWordNet sense 2 (unpleasantly and excessively suave or ingratiating in manner or speech):
buttery, fulsome, oily, oleaginous, smarmy, unctuousWordNet sense 3 (lacking sincerity):
insincereFrom the ODE community, based on WordNetadd/edit