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многотрудный adj.stresses
gen. formidable; laborious (medfly); difficult (MichaelBurov); very much difficult (MichaelBurov); operose
Gruzovik toilsome; very arduous; very difficult
Gruzovik, obs. formidable
uncom. tiresome (Баян); arduous (Супру)
многотрудно adv.
gen. drudgingly
obs. operosely