indefensible
1. [ adjective ] (of theories etc) incapable of being defended or justified
Synonyms: untenable
Related terms: unreasonable
2. [ adjective ] incapable of being justified or explained
Synonyms: unwarranted unjustifiable unwarrantable insupportable
Related terms: inexcusable
Similar spelling:   indefeasible
  indefinable
  inadvertence
  inadvertent
  indefatigable
  inadvertency