If you call someone a cretin, you think they are very stupid.
[offensive, disapproval]
cretin in British English
(ˈkrɛtɪn)
noun
1. old-fashioned
a person with cretinism
2. offensive
a person considered to be extremely stupid
Derived forms
cretinoid (ˈcretinˌoid)
adjective
cretinous (ˈcretinous)
adjective
Word origin
C18: from French crétin, from Swiss French crestin, from Latin ChrīstiānusChristian, alluding to the humanity of such people, despite their disability
cretin in American English
(ˈkritən; British ˈkrɛtɪn)
noun
1.
a person suffering from cretinism
2.
a very stupid or foolish person
Derived forms
cretinous (ˈcretinous)
adjective
Word origin
Fr crétin, dial. form of chrétien; lit., Christian, hence human being (in contrast to brutes) < LL(Ec) Christianus, Christian: sense development as in UNRESOLVED CROSS REF