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not easy to do, deal with, or understand
using a lot of effort
needing a lot of time, ability, and energy
difficult to deal with or achieve, but interesting and enjoyable
extremely difficult and involving a lot of effort
difficult, and needing a lot of physical or mental effort
extremely difficult, tiring, or damaging
difficult to do, deal with, or understand, especially because of involving a lot of different processes or aspects
to be difficult, tiring, or boring to do
a start-up … whose value has reached more than one billion US dollars
the system of trade unions, or the principles on which trade unions are based
an afternoon full of crafts
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Free thesaurus definition of difficult to do and involving a lot of effort from the Macmillan English Dictionary - a free English dictionary online with thesaurus and with pronunciation from Macmillan Publishers Limited.