Translation of "sumnja" into English

Postoji mala sumnja hoće li uspjeti ili ne.

There is little doubt as to whether he will succeed or not.

Je l'Derek imao neke sumnje tko je mogao ukrasti?

And did Derek have any suspicions as to who'd taken it?

Otuda bi isto tako mogla sumnjati u mogućnost svoje nastavnice da vrednuje i sam zadatak.

Hence, you might as well mistrust her judgment of the merits of the assignment.