Revising the concept of doubt in the Holy Quran

In holy Quran,Article " Shak " has been employed 15 times of which 6 times accompanied adjective " Morib" .this term has phonetic commonality with its Persian counterpart which causes misunderstanding .
Quranic use of the terms dates back to the time when there were no derivatives of term "skepticism (Shak) " ,hence etymology of connotation of this term has us refer to lexical properties as first step of investigation.as second,we dug into Quranic usage of this term with focus on political approaches using interpretive features.
Considering the diversity of uses of the term "Shak " as well as Quranic approaches ,we concluded that this term has 2 distinctive uses .the absence of adjective "Merib" with this term might be the cause of this discrepancy.