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Pronunciation varies by accent · noun
The quality or state of being insuperable; insuperableness..
Use insuperability when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Insuperability means The quality or state of being insuperable; insuperableness..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use insuperability where its definition matches the intended context.
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