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English word hardworking comes from English hard, English working
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hard (English)
(countable, nautical) A firm or paved beach or slope convenient for hauling vessels out of the water.. (uncountable, drugs, colloquial, slang) crack cocaine. (manner) Compactly.. (manner) With difficulty.. (manner) With much force or effort.. (now, archaic) Near, close.. (obsolete) So as to raise difficulties. (arts) Having a severe property; presenting a barrier to enjoyment.. [...]
working (English)
Enough to allow one to use something.. In paid employment.. Of or relating to employment.. That is or are functioning.. That suffices but requires additional work. (of bodies of water) Becoming full of a vegetable substance.. (usually plural) Operation; action.. Fermentation.. Method of operation.
hardworking (English)
Of a person, taking their work seriously and doing it well and rapidly.