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\\\"
造句
用作形容詞(adj.)
To get a state licence, MSBs have to go through a gruelling vetting process. 為了得到州內執照，現金回款企業必須通過一段另人精疲力竭的審查過程。
常用短語
Lendl\\\'s training programme is so gruelling that few people could keep up with it.