безопасен означава в английски

foolproof▼((device) fail-safe)
adjective
[UK: ˈfuːl.pruːf] [US: ˈfuːl.ˌpruːf]

safe [safer, safest]▼(providing protection from danger)
adjective
[UK: seɪf] [US: ˈseɪf]

secure [securer, securest]▼(free from attack or danger; protected)
adjective
[UK: sɪ.ˈkjʊə(r)] [US: sɪ.ˈkjʊr]