Where does “głupowaty” come from?

głupowaty (Polish) comes from Polish -owaty, from Polish -owy, from Old Polish -owy, from Proto-Slavic -ovъ — of, belonging to.

Ancestry of “głupowaty”, step by step

StepLanguageWordMeaning
1Polish-owatyforms masculine adjectives meaning having a trait
2Polish-owy-y
3Old Polish-owyappended to nouns to form adjectives; -y
4Proto-Slavic-ovъof, belonging to
Every word from Proto-Slavic -ovъ →Every word from Polish -owy →Every word from Polish -owaty →