The increase in the number of terrorist attacks especially the shocking event of 9/11 led to wide coverage of topics such as terrorism and extremism. Such coverage is not only conveyed by the media and newspaper articles but also by creating novels. As such a result, the current study focuses on extremism as a concept and how it is ideologically embedded within a text. This study is confined to Don DeLillo’s Falling man (2007) through which he makes his language as a vehicle to describe the trauma
caused by 9/11 attacks and mirroring Islam as an extreme religion.  To access the concept of extremism in this novel, the researchers will apply a critical stylistic approach, depending on the textual conceptual model that is represented by Jeffries (2010) to uncover the hidden ideologies related to extremism. The current study aims at investigating the way the linguistic meaning is used as a vehicle for constructing the ideology of extremism in the selected novel; in addition to identifying the textual meaning that underlies extremism in the selected novel.  With the aid of critical stylistic tools, the researchers find out that DeLillo employs the use of certain linguistic choices in his novel which tackle the concept of extremism focusing on the violent attitude behind such a concept with an attempt to link this concept to Islam and Muslims.