The difference between Insufferable and Unbearable
When used as adjectives, insufferable means not sufferable, whereas unbearable means so unpleasant or painful as to be unendurable.
check bellow for the other definitions of Insufferable and Unbearable
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Insufferable as an adjective:
Not sufferable; very difficult or impossible to endure.
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Unbearable as an adjective:
so unpleasant or painful as to be unendurable