non-returnable
From Longman Dictionary of Contemporary Englishnon-returnableˌnon-reˈturnable adjective 1 a non-returnable amount of money cannot be paid back to you Please send this form back with a non-returnable deposit of £60.2 things that are non-returnable cannot be taken back to a shop and used again non-returnable bottlesExamples from the Corpusnon-returnable• The Specification will be available for purchase on payment of £100, non-returnable.