Extended means "stretched-out," "prolonged," "widespread," "outstretched": "When the basketball player's body was fully extended, he was nearly 7 feet tall." "The wires were then extended from one post to another." "His extended remarks lasted for nearly an hour." Extensive shares these meanings with extended but more specifically means "wide,"' "of great extent," "broad," "far reaching": "His influence is extensive throughout the region." "As he continued to purchase acreage, his holdings became more and more extensive." "Although his knowledge of the subject was extensive, the speaker's remarks seemed boringly extended."
Dictionary of problem words and expressions. Harry Shaw. 1975.