The word "most inured" refers to being the most accustomed or resistant to certain stimuli. Some antonyms for this phrase could include "least adapted," "unfamiliar," or "unaccustomed." These words suggest a lack of experience or exposure to a particular situation. Other antonyms might include "sensitive," "vulnerable," or "susceptible," indicating a greater likelihood of being affected by the given stimuli. Overall, these antonyms paint a picture of someone or something that is less hardened or habituated, and more susceptible to change or influence, than something that is "most inured.