dimbulb

[dim-buhlb, -buhlb] /ˈdɪmˌbʌlb, -ˈbʌlb/
noun, Slang.
1.
a stupid person; dimwit.
Origin
1930-35, Americanism; dim + bulb
British Dictionary definitions for dim bulb

dim bulb

noun
1.
(informal) a slow-witted unintelligent person
Slang definitions & phrases for dim bulb

dim bulb

noun phrase

A stupid person; dimwit: a peculiar combination of dim bulb and bump-on-a-log/ Heroes meant to be swankily sexy tend to come off as tight-lipped dim bulbs (1920s+)