Most acceptive, meaning the most willing to accept or receptive, has several antonyms. The opposite of most acceptive is "least acceptive", which suggests that someone or something is not open or willing to accept ideas or information. Other antonyms include "opposed", "resistant", "unyielding", or "unreceptive", which indicate that the person or thing in question is unwilling to consider something or is actively opposing it. Additionally, "unresponsive", "ignorant", and "heedless" can also be antonyms for most acceptive, implying a lack of interest or attention toward new ideas. It is essential to understand these antonyms to accurately describe different attitudes or responses towards new information or ideas.