The most dangerous UFC fighter is highly debated and subjective, as different fighters have different skills that can make them dangerous in the octagon. However, Khabib Nurmagomedov is considered to be the most difficult fighter to defeat. He is an incredibly powerful wrestler with an undefeated record of 27-0 in the UFC. Additionally, Khabib has an impressive array of striking and submission victories as well as an impressive winning streak, which makes him one of the most dangerous fighters in the UFC.