tireless

• Audio (Southern England):

  (file)

(intransitive) tire + -less

tireless (not comparable)

1. Indefatigable, untiring and not yielding to fatigue
   • 2011 November 12, “International friendly: England 1-0 Spain”, in BBC Sport‎^[1]:

     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.

• untiring

• tirelessly
• tirelessness

From tire +‎ -less.

tireless (not comparable)

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

• Leisters, leisters, riteless