Also means
unavailable (by phone)
Usage Note
Injoignable is a specifically French usage meaning impossible to contact, especially by phone or message. It is derived from joindre (to reach someone). An equally common synonym is inatteignable, but injoignable is more specifically telephonic in register.
Examples
"Il est injoignable depuis ce matin."
Natural Translation
He has been unreachable since this morning.

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