Maybe I am being stubborn but this is what I sincerely believe. Ίσως να είμαι ισχυρογνώμων, αλλά ειλικρινά αυτή είναι η πεποίθησή μου. He is pretty stubborn about his political beliefs, so why bother arguing?Blood can make a very stubborn stain on fabrics if not washed properly