Arduous
Webster's Practical Dictionary- A Practical Dictionary of the Englih Language · 1884 · p. 33
ard'u-us, «. High or lofty; attended with great labor, like climbing heights; difficult.
Bu kavram başka kaynaklarda da geçiyor
French-English and English-French Commercial Dictionary (1918)
The American Dictionary and Cyclopedia (1910)
Chamber's Twientieth Century Dictionary (1908)
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