altered(having been changed) adjective [UK: ˈɔːl.təd] [US: ˈɒl.tərd]I knew I shouldn't have altered the material. = Sabía que no tenía que haber alterado el material.
impaired(rendered less effective) adjective [UK: ɪm.ˈpeəd] [US: ˌɪm.ˈperd]
inalteradoadjective
unaltered(remaining in its initial state) adjective [UK: ʌn.ˈɔːl.təd] [US: ʌ.ˈnɒl.tərd]