Synonyms: indefensible, insupportable, unjustifiable, unwarrantable, unwarranted
Definition: incapable of being justified or explained
Similar words: inexcusable
Definition: without excuse or justification
Synonyms: untenable, indefensible
Definition: (of theories etc) incapable of being defended or justified
Similar words: unreasonable
Definition: not reasonable; not showing good judgment
Synonyms: indefensible
Definition: not able to be protected against attack