adjective

unwearied

un-WEER-eed/ˌʌnˈwɪrid/

not tired or weakened by effort

The unwearied runner maintains a springy stride while his companion bends over exhausted.

At a running-track finish line, a middle-aged man remains upright and springy in his stride while a fellow runner has stopped, bent over with hands on knees.

Etymology

unOld Englishnot

+weariOld Englishto exhaust, make tired

+edEnglishpast-participle ending

The verb behind wearied meant “to exhaust” or “make tired.” Negating that resulting state gives the idea of someone whose energy has not been worn down.

In context

Libranima110:00

And now the battle again raged furiously at the ships. You would have thought the men were coming on fresh and unwearied, so fiercely did they fight

The Iliad - Homer (Illustrated Audiobook) Part 2 of 2

More examples

After the long climb, Maya is still unwearied.
He listens with unwearied attention throughout the lengthy discussion.
The volunteers seem unwearied as they prepare another round of meals.

Forms

unwearied

Similar words

tireless: Suggests seemingly limitless energy, not just an absence of fatigue.
untiring: Emphasizes continuing effort over time rather than a current condition.