Antonym of hipster. Not to be confused with dullard.
"Some men like a dull life - they like the routine of eating breakfast, going to work, coming home, petting the dog, watching TV, kissing the kids, and going to bed. Stay clear of it - it's often catching."
-- Hedy Lamarr
Non-derogatory term coined by the Dull Men's Club as an identifying label for its members. Since then, dullster has been used to describe anyone that:
Source:
https://dullmensclub.com/dmcs-word-factory/