In the context of the passage, "coarse" is best interpreted as crude.
<h3>Fetters and headsmen.</h3>
In the passage, it was stated by the author that tyranny formerly employed Fetters and headsmen and they were described as coarse instruments; however, their current civilization has perfected despotism itself, though it seemed to have nothing to learn.
Based on the excerpt, the author's use of the word "coarse" is best interpreted as crude because they were unrefined in their thinking and manner approach to work. Thus, they didn't learn anything new with respect to the civilization of their time.
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