"soapiest" in the adjective sense
1. saponaceous, soapy
resembling or having the qualities of soap
"a soapy consistency"
2. buttery, fulsome, oily, oleaginous, smarmy, soapy, unctuous
unpleasantly and excessively suave or ingratiating in manner or speech
"buttery praise"
"gave him a fulsome introduction"
"an oily sycophantic press agent"
"oleaginous hypocrisy"
"smarmy self-importance"
"the unctuous Uriah Heep"
"soapy compliments"
Source: WordNet® (An amazing lexical database of English)
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