Estranged means no longer in contact with a relative. His estranged wife, estranged from her family, an estranged son.
It is the formal word and it appears in obituaries and court reports, where it records a fact without explaining it. It usually describes a lasting silence rather than a quarrel, and the estrangement is often never formally announced by either side. Note strange, from which it comes.
1adjectiveestrangedNo longer in contact with a relative.
“She hasn't spoken to her estranged father since she was a teenager.”
estranged is a state of separation.
Latin
extraneus — foreigner, stranger
Old French
estranger — to treat as a stranger
English
estrange
English, today
estranged
estrange comes from Old French estranger (“to treat as a stranger”), from Latin extraneus (“foreigner, stranger”) (from which also strange, stranger). Also see Spanish extraño.
Etymology from Wiktionary, CC BY-SA