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Adjective: justificative  'jús-tu-fu,key-tiv
  1. Providing justification
    "He presented a justificative argument for his actions";
    - justificatory, vindicatory
     
  2. Attempting to justify or defend in speech or writing
    "She offered a justificative explanation for her actions";
    - defensive, justificatory

See also: apologetic, exculpatory, excusatory