The antonyms of "more fleeceable" include words like savvy, shrewd, canny, astute, discerning, and wise. These words describe someone who is not easily fooled or taken advantage of. They possess the ability to see through deception and make well-informed decisions. These individuals are often regarded as intelligent, practical, and sensible. They have a sharp mind and are able to process information quickly, making it difficult for anyone to swindle them. In contrast to the term "more fleeceable," these antonyms indicate a certain level of awareness and cunning that protects one from being deceived or exploited.