Source : Webster's Revised Unabridged Dictionary (1913)

Unwearied \Un*wea"ried\, a.
   Not wearied; not fatigued or tired; hence, persistent; not
   tiring or wearying; indefatigable. -- {Un*wea"ried*ly}, adv.
   -- {Un*wea"ried*ness}, n.

Source : WordNet®

unwearied
     adj : with unreduced energy [syn: {untired}, {unweary}]