1. the quality of requiring or involving great effort, energy, or exertion

Examples

• The strenuousness of the hiking trail surprised even experienced climbers.
• She admired the strenuousness with which he approached his studies.
• The coach warned the team about the strenuousness of the upcoming training camp.
• The strenuousness of the debate left both candidates exhausted.
• Despite the strenuousness of the work, the volunteers remained enthusiastic.
• The strenuousness of her exercise routine helped her achieve her fitness goals.