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Difficult to do and involving a lot of effort

difficult adjective

not easy to do, deal with, or understand

hard adverb

using a lot of effort

tough adjective

difficult

demanding adjective

needing a lot of time, ability, and energy

challenging adjective

difficult to deal with or achieve, but interesting and enjoyable

arduous adjective

extremely difficult and involving a lot of effort

taxing adjective

difficult, and needing a lot of physical or mental effort

gruelling adjective

very difficult and involving a lot of continuous effort

complicated adjective

difficult to do, deal with, or understand, especially because of involving a lot of different processes or aspects

be an effort phrase

to be difficult, tiring, or boring to do