Indefensibility is the state of being unable to be defended or justified. Some synonyms for this word are indefensibleness, insupportableness, unsustainability, and unjustifiability. These words indicate a similar lack of validity or logical reasoning. Other synonyms include unreasonableness, untenability, impracticability, and improbability. These terms imply that a proposal or argument is baseless or illogical. It's important to use synonyms in our writing to avoid repetition and to make our communications more captivating and engaging. Whether it's for academic, business, or personal purposes, it's always essential to use the right words to convey our messages effectively.