Where does “stępiały” come from?

stępiały (Polish) comes from Polish stępieć, from Polish tępieć, from Polish -ec, from Old Polish -ec, from Proto-Slavic -ьcь, from Lithuanian -ikas, from Proto-Indo-European -iḱos — -y, -ic.

Ancestry of “stępiały”, step by step

StepLanguageWordMeaning
1Polishstępiećto become stupid, to go daffy, to grow stupid
2Polishtępiećto become stupid, to go daffy, to grow stupid
3Polish-ecA masculine suffix
4Old Polish-ecforms nouns
5Proto-Slavic-ьcьForms diminutives from nouns; Forms nouns from...
6Lithuanian-ikas
7Proto-Indo-European-iḱos-y, -ic
Every word from Proto-Indo-European -iḱosEvery word from Polish -ecEvery word from Proto-Slavic -ьcь