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    arduous


arduous adj ['а:djuǝs]

1. трудный
2. крутой, труднодоступный
3. энергичный
4. ревностный

We couldn't find phrases with arduous in English to Russian Common Words Pro dictionary.
Phrases with arduous has been found in the following dictionaries:

English-Russian Business
English-Russian Marketing
English-Russian Telecommunications
English-Russian Mechanical