unc·tu·ous 
/ˈʌŋktʃəwəs/ adjective
/ˈʌŋktʃəwəs/ adjective [more unctuous; most unctuous] formal + disapproving — used to describe someone who speaks and behaves in a way that is meant to seem friendly and polite but that is unpleasant because it is obviously not sincere ▪ an unctuous hostess
— unc·tu·ous·ly adverb
— unc·tu·ous·ness noun [noncount]
