adj. 25B6; adjective SYCOPHANTIC, ingratiating, obsequious, fawning, servile, grovelling, subservient, cringing, humble, hypocritical, insincere, gushing, effusive; glib, smooth, slick, slippery, oily, greasy; informal smarmy, slimy, sucky, soapy.
UNCTUOUS
Meaning of UNCTUOUS in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012