Meaning of “arduous” in the English Dictionary

"arduous" in British English

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arduousadjective

uk /ˈɑː.dʒu.əs/ us /ˈɑːr.dʒu.əs/

(Definition of “arduous” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"arduous" in American English

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arduousadjective

us /ˈɑr·dʒu·əs/

difficult and tiring, or needing a great deal of effort:

In those days, a trip to the West was an arduous journey.

(Definition of “arduous” from the Cambridge Academic Content Dictionary © Cambridge University Press)