nierozłączny nierozdzielny v angličtině:

They are inseparable.

He and I have been inseparable friends since our student days.

Jane and Sarah soon became inseparable companions.

In a maritime country, maritime matters are an inseparable part of a complex logistical system and are an integral part of the country's overall economic system.

Good health is inseparable from exercise and moderation.

Society and the individual are inseparable.

John and Peter are inseparable friends.