The word "most vulnerary" means most susceptible or prone to injury or harm. Antonyms for this term can vary depending on the context of usage. In a physical sense, antonyms for "most vulnerary" can include: robust, sturdy, strong, and resilient. In a social or emotional sense, antonyms can include: confident, secure, safe, and protected. Additionally, other antonyms can include invulnerable, impervious, and impermeable, which are all synonyms for "indestructible" or "untouchable." These antonyms suggest the exact opposite of the meaning of "most vulnerary," indicating strength, toughness, and protection against physical or emotional harm.