unctuous/ˈʌŋktjuəs; `ʌŋktʃʊəs/ adj(derog 贬) insincerelyearnest or flattering, esp in an oily way 虚情假意的, 谄媚的（尤指油腔滑调的） speak in unctuous tones 油腔滑调地说 unctuous assurances 虚情假意的承诺.
牛津英汉双解词典