Unbridgeable
Definition 1 of 1

Conflict
Indicates severe disagreements that cannot be resolved

In many cases of conflict, understanding one another may seem unbridgeable.
Pathos
Elicits strong emotions when describing separations

Describing a relationship as unbridgeable evokes a deep sense of loss.
Compare with
insurmountableimpassableunfathomableirreconcilableunattainable
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