Overly suave WSJ Crossword Clue

Think of someone whose charm is as slippery as a well-lubricated surface.

???? means excessively smooth or ingratiating in manner.

The term '????' is often used metaphorically to describe someone who is excessively smooth or ingratiating, much like how oil is slick and smooth. The clue 'overly suave' suggests a negative connotation, implying insincerity or excessive charm, which aligns with the figurative use of '????.'

Like your hands after eating potato chips, perhaps, Covered in grease, Slippery, Like sardines and mackerel, Like unwashed hair, perhaps