- indefensible: incapable of being justified or explained
- baseless: without a basis in reason or fact; "baseless gossip"; "the allegations proved groundless"; "idle fears"; "unfounded suspicions"; "unwarranted jealousy"
- undue: lacking justification or authorization; "desire for undue private profit"; "unwarranted limitations of personal freedom"
- Not warranted; unjustified; being without warrant, authority, or guaranty; unwarrantable