отказник означает в английский

conscientious objector▼(someone refusing to fight in an armed conflict because of religious or moral principles)
noun
[UK: ˌkɒn.ʃɪ.ˈen.ʃəs əb.ˈdʒek.tə(r)] [US: ˌkɑːn.ʃi.ˈen.ʃəs əb.ˈdʒek.tər]

refusenik▼(person who refuses to do something)
noun
[UK: rɪ.ˈfjuːz.nɪk] [US: rə.ˈfjuːz.nɪk]