The term 'papertiger' is often used to describe something or someone that appears to be powerful, but is actually weak or ineffectual. Therefore, antonyms for 'most papertiger' could be words that convey strength and power. Examples include 'invincible', 'formidable', 'strong', 'potent', 'robust', 'dominant', 'resilient', 'impregnable', 'mighty', and 'unbeatable'. Each of these words suggests traits that are completely opposite to those associated with a papertiger, such as resilience, dominance, and unbeatability. Using these antonyms can help you express your ideas with precision and clarity, and convey the exact meaning and tone that you want.