нелегален означава в английски

clandestine▼(done or kept in secret)
adjective
[UK: klæn.ˈde.stɪn] [US: klæn.ˈde.stən]

illegal▼(contrary to or forbidden by law)
adjective
[UK: ɪ.ˈliːɡ.l̩] [US: ˌɪ.ˈliːɡ.l̩]