smarm ‧ y /ˈsmɑːmi $ -ɑːr-/ BrE AmE adjective
[ Date: 1900-2000 ; Origin: smarm '(to behave with) insincere politeness' (19-21 centuries) , of unknown origin ]
polite in an insincere way – used to show disapproval:
smarmy comments
a smarmy car salesman