Dictionary![]() ![]() gru•el•ingPronunciation: (grOO'u-ling, grOO'ling), [key] —adj. exhausting; very tiring; arduously severe: the grueling Boston marathon. —n. 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.
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