Montresor shows his slickness when he first greets Fortunato with compliments like “you are luckily met” and “How remarkably well you are looking today” (p.374). Later, when he talks about the Amontillado he manipulates Fortunato by telling him he is on the way to Luchesi to check it out, which peaks his interest and wants to go instead of Luchesi. Though he doesn't realize that it is a trap, he takes the bait.
Montresor only cares about slaughtering his once old friend.
Montresor has to be cautious when he plots his revenge and has to be precise. Toward the end of the story Montresor “thrust a torch through the remaining aperture” to be cautious that he was officially dead. He wanted to make sure that Fortunato was completely dead. Montresor wasn’t the only one that had to be cautious. Fortunato had to aswell, but he never realized it.
Montresor’s hard-heartedness pops out when he laughs at Fortunato’s immolation. “Ha! Ha! ha!---he!he!--- a very good joke indeed---an excellent jest” (p379). He has no heart at all for anyone, only his desire of getting revenge on others. An another example of his hard-heartedness is shown while Montresor and Fortunato are walking to the “Amontillado” where tons of bones lying on the ground. Montresor only cares about himself and his interests at heart, getting revenge.