Final answer:
Sullivan's portrayal of Faulkner suggests that the words Complex, Intricate, and Dense best describe his literary style and storytelling ambition, due to his use of modernist techniques and profound thematic exploration.
Step-by-step explanation:
When considering which words best describe Sullivan's overall impression of Faulkner, the information provided emphasizes Faulkner's sophisticated and profound narrative style as he delved into the 'problems of the human heart in conflict with itself.' His work, characterized by an intricate blend of modernist techniques, including stream-of-consciousness and non-linear storytelling, can be described using several adjectives. However, based on Sullivan's overview of his range and ambition, as well as the deeply regional and rich nature of Faulkner's tales, the words Complex, Intricate, and Dense appropriately capture the essence of Faulkner's literary body of work as Sullivan portrayed it. These words efficiently reflect Faulkner's style and storytelling technique, as he utilized an elaborate narrative structure to explore universal truths through the detailed lives of his Southern characters.