in·de·fat·i·ga·ble /ˌɪndɪˈfætɪgəbəl/
  (a.)不知疲倦的,有耐性的,不屈不撓的
  In·de·fat·i·ga·ble a.  Incapable of being fatigued; not readily exhausted; unremitting in labor or effort; untiring; unwearying; not yielding to fatigue; as, indefatigable exertions, perseverance, application. “A constant, indefatigable attendance.”
     Upborne with indefatigable wings.   --Milton.
  Syn: -- Unwearied; untiring; persevering; persistent.
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  indefatigable
       adj : showing sustained enthusiastic action with unflagging
             vitality; "an indefatigable advocate of equal rights";
             "a tireless worker"; "unflagging pursuit of excellence"
             [syn: tireless, unflagging, unwearying]