Pronunciation: (grOO'u-ling, grOO'ling), Strict Standards: Non-static method FenSites::linkTo() should not be called statically in /site/html/dictionary/grueling.html on line 79 [key]
exhausting; very tiring; arduously severe: the grueling Boston marathon.
any trying or exhausting procedure or experience. Also, esp. Brit.,gru'el•ling.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.