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grueling

gru·el·ing

grueling

 
pronunciation:
gru lIng
part of speech: adjective
definition: extremely tiring or demanding; arduous.
grueling exercise
synonyms:
arduous, laborious, strenuous, uphill, wearisome
similar words:
demanding, difficult, exhausting, fierce, hard, harsh, relentless, rough, severe, tiring, unsparing