Select the option that can be used as a one-word substitute for the given group of words.

One who does not tire easily

Indefatigable

The word that can be used as a one-word substitute for one who does not tire easily is indefatigable.

• Indefatigable means incapable of being tired out; not yielding to fatigue; untiring.
• Pedantic means excessively concerned with minor details or rules; overscrupulous.
• Recluse means a person who lives in seclusion or isolation.
• Libertine means a person who believes in or practices unrestrained freedom, especially in sexual matters.