noun
a person who lives on or explores the frontiers, especially the American West
adjective
frontier-related or characteristic of a frontiersman
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The frontiersman was known for his skill in navigating through uncharted territories.
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The frontiersman was a real tough guy who could survive in the wild.
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That frontiersman is a real trailblazer, always exploring new lands.
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In the world of technology, he was considered a frontiersman, always pushing the boundaries of innovation.