The word(s) "doubted" appears 2 time(s) in 2 verse(s) in Quran in Muhammad Habib Shakir translation.

(1) And you did not recite before it any book, nor did you transcribe one with your right hand, for then could those who say untrue things have doubted.

(2) They will cry out to them: Were we not with you? They shall say: Yea! but you caused yourselves to fall into temptation, and you waited and doubted, and vain desires deceived you till the threatened punishment of Allah came, while the archdeceiver deceived you about Allah.