/ˈɑːrdʒuəs/
ar·du·ous
BrE /ˈɑːdjuəs/,
/ˈɑːdʒuəs/
NAmE /ˈɑːrdʒuəs/
involving a lot of effort and energy, especially over a period of time
an arduous journey across the Andes
The work was arduous.
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ar·du·ous·ly
BrE /ˈɑːdjuəsli/,
/ˈɑːdʒuəsli/
NAmE /ˈɑːrdʒuəsli/