Main Entry: gru·el·ing

Variant(s): or gru·el·ling \ˈgrü-ə-liŋ\

Function: adjective

Etymology: from present participle of obsolete gruel to exhaust, punish, from gruel, noun

Date: 1852

: trying or taxing to the point of exhaustion : punishing <a grueling race>

— gru·el·ing·ly \-liŋ-lē\ adverb