Where does “umyślić” come from?

umyślić (Polish) comes from Polish myślić, from Old Polish myślić, from Proto-Slavic mysliti, from Proto-Slavic myslь, from Proto-Indo-European muHdʰ-.

Ancestry of “umyślić”, step by step

Step	Language	Word	Meaning
1	Polish	myślić	—
2	Old Polish	myślić	—
3	Proto-Slavic	mysliti	to think
4	Proto-Slavic	myslь	thought, idea
5	Proto-Indo-European	muHdʰ-	—

Every word from Proto-Indo-European muHdʰ- →

umyślić — Etymology, Origin & Word History | Etymology Explorer