ˈɑːdjuːəs ˈɑːɹd͡ʒuəs ˈɡɹʊə.lɪŋ ˈɡɹu.lɪŋ hɑːd hɑɹd ˈhɛ.vi

ləˈbɔːɹiəs ˈɒpəɹəʊs ˈpʌnɪʃɪŋ ˈstɹɛnjuəs ˈtɔɪlsəm difficult to accomplish; demanding considerable mental effort and skill the arduous work of preparing a dictionary characterized by effort to the point of exhaustion; especially physical effort worked their arduous way up the mining valley a grueling campaign hard labor heavy work heavy going spent many laborious hours on the project set a punishing pace taxing to the utmost; testing powers of endurance his final, straining burst of speed a strenuous task your willingness after these six arduous days to remain here