The term "admissive" refers to actions or behaviors that are open or receptive, so the antonyms for "admissive" include words like closed, unresponsive, resistant, and unyielding. Other antonyms for "admissive" may include words like exclusive, unaccommodating, intolerant, and uncooperative. These words are commonly used to describe attitudes or behaviors that are unwelcoming, uninviting, or unwilling to accept new ideas or people. When we encounter antonyms for the word "admissive," we are often reminded of the importance of being open-minded and accepting of different people and ideas, even if they challenge our previously held beliefs or opinions.