'Impenetrable' in the Bible

They will cut down her forest," {declares} Yahweh, "for {it is impenetrable}. Yes, they are more numerous than locusts, and {they are without number}.

Wail, O juniper, for [the] cedar has fallen, for [the] magnificent [trees] are ruined! Wail, oaks of Bashan, for the impenetrable forest has come down!