Answer: strenuous, requiring significant effort
arduous
adjective
Word Origin mid 16th century: from Latin arduus 'steep difficult' + -ous.
Derivatives
Scrabble Points: 8
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hard difficult arduous mean demanding great exertion or effort. hard implies the opposite of all that is easy. farming is hard work difficult implies the presence of obstacles to be surmounted or puzzles to be resolved and suggests the need of skill or courage. the difficult ascent of the mountain arduous stresses the need of laborious and persevering exertion. the arduous task of rebuilding
41 synonyms of arduous from the Merriam-Webster Thesaurus plus 61 related words definitions and antonyms. Find another word for arduous . Arduous : requiring considerable physical or mental effort.
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Arduous definition requiring great exertion; laborious; difficult: an arduous undertaking. See more.
difficult and tiring or needing a great deal of effort: In those days a trip to the West was...