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Difficult to do and involving a lot of effort - synonyms or related words

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

to be difficult, tiring, or boring to do

nanodegree

a course of study which is much shorter than a university course and focuses on the skills you need for a job, especially computer-related skills

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Open Dictionary

hypocaust

an ancient Roman system of underfloor heating, used to heat houses with hot air; from the Latin 'hypocaustum'

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