Below are possible answers for the crossword clue Not the brightest bulb on.
5 letter answer(s) to not the brightest bulb on
slow to learn or understand; lacking intellectual acuity; "so dense he never understands anything I say to him"; "never met anyone quite so dim"; "although dull at classical learning, at mathematics he was uncommonly quick"- Thackeray; "dumb officials make some really dumb decisions"; "he was either normally stupid or being deliberately obtuse"; "worked with the slow students"
having high relative density or specific gravity; "dense as lead"
hard to pass through because of dense growth; "dense vegetation"; "thick woods"
permitting little if any light to pass through because of denseness of matter; "dense smoke"; "heavy fog"; "impenetrable gloom"
6 letter answer(s) to not the brightest bulb on
a stupid incompetent person
4 letter answer(s) to not the brightest bulb on
A silly or foolish person
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