Stubborn = Uparty.
uparty, oporny
Stubborn in Greek is pismataris [πεισματάρης].
stubborn is têtu / têtue in French.
Polish in Polish is "Polski".
To say Jonathan in Polish, you would say "Janusz."
"No" in Polish is "Nie".
obstinado
"Ganko."
To say "uncle" in Polish, you would say "wujek."
To say "June" in Polish, you would say "czerwiec."
You can say "the end" in Polish as "koniec."
this is how you say today in polish: dzisiaj :PPP