Canadian English Language Proficiency Index Program (CELPIP) Vocabulary Practice Test

The term that describes something that is impossible to subdue is "indomitable." This word conveys an idea of strength and resilience, suggesting that a person or a spirit cannot be defeated or overcome, even in the face of challenges or adversities. It embodies the concept of an unconquerable nature, often associated with determination and an unyielding will.

In contrast, "inscrutable" refers to something that is difficult to understand or interpret, typically relating to a person's expression or intent rather than to any notion of resistance or subjugation. "Insurmountable" generally describes obstacles that seem too great to overcome, while "intercede" means to intervene on someone's behalf, which does not relate to the concept of being unable to be subdued. Each of these terms has its distinct meaning, but "indomitable" specifically captures the essence of an unstoppable force or spirit.