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Pronunciation varies by accent · noun
The state or condition of being unrelentless ("relentless"); relentlessness, unrelentingness..
Use unrelentlessness when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Unrelentlessness means The state or condition of being unrelentless ("relentless"); relentlessness, unrelentingness..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use unrelentlessness where its definition matches the intended context.
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