adjective. Impossible to excuse, pardon, or justify.

Not justifiable; not defensible or right.

adjective. That cannot be justified, excused or pardoned

adjective. incapable of being justified or explained

"Japanese veterans' associations and tribal leaders in the Philippines wrote to the country's Commission on Indigenous People urging them to stop Kuentai from carrying out any further work, which they called "unjustifiable, profane and even socially evil"."

inexcusable  

liable  pliable  reliable  undeniable  unreliable  

gratuitous  impolitic  improper  indefensible  inexcusable  

inexcusable  unwarrantable