noun
A person who draws conclusions based on evidence or reasoning
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The conclusionist in the research team was responsible for analyzing all the data and drawing final conclusions.
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My friend likes to call himself a conclusionist because he always has a strong opinion on everything.
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I don't trust that conclusionist, he always jumps to conclusions without considering all the facts.
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She was a conclusionist in matters of the heart, always quick to decide if someone was worth her time or not.