What is an antonym for "indomitable"?

The correct choice for an antonym of "indomitable" is indeed "weak." The term "indomitable" describes someone or something that cannot be subdued or overcome; it conveys a sense of unyielding strength and invincibility in the face of challenges. Therefore, "weak" serves as an appropriate antonym, as it implies a lack of strength or resilience, contrasting directly with the notion of being indomitable.

The other options do not effectively serve as antonyms. "Unyielding" suggests a strong and resolute nature, which aligns more closely with the idea of being indomitable. "Resilient" indicates the ability to recover or bounce back from difficulties, which also reflects strength rather than its opposite. Lastly, "invincible" suggests the inability to be defeated or overcome, which is synonymous with being indomitable rather than contrasting with it. Hence, "weak" represents the opposite quality effectively.