Sentence:  Bart spies an opportunity to make a quick buck so he channels his <WSD>inner</WSD> carny and posits his sinking house as a natural wonder of the world and its inhabitants as freaks, barking to dazzled spectators, “Behold the horrors of the Slanty Shanty! See the twisted creatures that dwell within! Meet Cue-Ball, the man with no hair!” 
Meaning of the word marked with <WSD> tags:  Of mind or spirit, relating to the mind or spirit, to spiritual or mental processes, mental, spiritual, relating to somebody's private feelings or happening in somebody's mind, existing as an often repressed part of one's psychological makeup.