Little arduous as his professional duties were, he would have been convicted of frivolity by the whole Mingott clan if he had suggested asking for a holiday in mid-winter; and he accepted May’s departure with the resignation which he perceived would have to be one of the principal constituents of married life.
There are no more uses of "arduous" in the book.
Show samples from other sources
At last, they won their long and arduous fight for independence.
She undertook the arduous work of caring for twins.