tireless

Etymology 1

(intransitive) tire + -less

adj

  1. Indefatigable, untiring and not yielding to fatigue
    James Milner's angled free-kick was headed on to the post by the tireless Bent and Lampard the opportunist was perfectly placed to stoop and head in from virtually on the goal-line. November 12, 2011, “International friendly: England 1-0 Spain”, in BBC Sport

Etymology 2

tire + -less

adj

  1. Without a tire (wheel covering); tyreless.

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