Requiring Great Effort

Requiring great effort crossword clue. Down crossword question at UK Daily Mirror on 6 Jun 2017, 7 letters.

The answer: ARDUOUS

Other correct answers: STRENUOUS, HERCULEAN, LABORED, LABORIOUS

Arduous, a word that express tiresome, exhausting. Arduous is an adjective that collocates with these nouns: task, climb, journey, process, task, trek, voyage and work.

It fits well when you want to show that you’ve worked hard in something or you’ve done something that was exhausting, e.g.
– It was an arduous climb up the mountain.
– The job involved the most arduous of conditions with no maintenance or lubrication.
– After an arduous campaign, the Natal force (about 5000 strong) being commanded by Col.