grueling

The definition of grueling is something exhausting, challenging or demanding.

(adjective)

A tough and challenging bicycle ride that is very strenuous is an example of a ride that would be described as grueling.

See grueling in Webster's New World College Dictionary

adjective

extremely trying; exhausting

Origin: prp. of obs. v. gruel, to punish < gruel

noun

Brit., Informal harsh treatment or punishment

See grueling in American Heritage Dictionary 4

also gru·el·ling

adjective

Physically or mentally demanding to the point of exhaustion: a grueling campaign.

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