Most leonine refers to qualities that are similar to a lion, which could mean powerful, majestic, or fierce. However, if one were to think of antonyms for this term, they could include words like weak, feeble, or submissive. These terms reflect the opposite of the qualities often associated with lions, such as strength, courage, and ferocity. Other possible antonyms for "most leonine" could include words like cowardly, timid, or meek. Overall, these antonyms paint a picture of someone or something that lacks the noble qualities often attributed to lions, and instead are characterized by timidity, frailty, or submission.