[adjective] [formal] [disapproving] - (of a person or their manner) full of praise, interest, friendliness, etc. that is unpleasant because it is falseHe came up to me, oozing unctuous sympathy, hoping that I would buy him a drink.
UNCTUOUS
Meaning of UNCTUOUS in English
Cambridge English vocab. Кембриджский английский словарь. 2012