Antonyms for the word "adoptability," which refers to the ability of something or someone to be taken in or accepted, could include rejection, exclusion, alienation, or disapproval. When something lacks adoptability, it may be difficult to find a home, support system, or acceptance in a given context. This could be due to factors like cultural differences, physical limitations, or a lack of social skills or experience. Antonyms of adoptability may also include refusal or reluctance, indicating a personal or institutional bias against certain individuals or groups. Ultimately, the opposite of adoptability suggests a lack of openness, flexibility, or empathy, and may indicate deeper issues around discrimination or prejudice.