Meaning of 'indefensible'

adjective

so horrible and distasteful to people that it's incapable of being justified or explained

Example: "The way you treated them was absolutely indefensible."

Synonyms: insupportable unjustifiable unwarrantable unwarranted

adjective

incapable of being logically explained as a concept or idea

Example: "The theory was indefensible, and was quickly dismissed by the scientific community."

Synonyms: untenable

adjective

not able to be protected against a literal attack

Example: "The lack of a natural barrier made the city almost indefensible."