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• n  tireless determination

• Reports suggest that many of the traits that mark Romney's campaign style - his meticulously prepared presentation, his apparent tirelessness, his iron discipline in not straying .
• He makes no apologies about repeating the same lines about her tirelessness that everyone else brandishes.
• Many Americans concede nothing to the Japanese in the tirelessness department.

• indefatigability
• indefatigableness