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

(1) And thou (O Muhammad) wast not a reader of any scripture before it, nor didst thou write it with thy right hand, for then might those have doubted, who follow falsehood.

(2) They will cry unto them (saying): Were we not with you? They will say: Yea, verily; but ye tempted one another, and hesitated, and doubted, and vain desires beguiled you till the ordinance of Allah came to pass; and the deceiver deceived you concerning Allah;