for·ti·tude /ˈfɔrtəˌtud, ˌtjud/
  剛毅,堅毅,不屈不撓
  For·ti·tude n.
  1. Power to resist attack; strength; firmness. [Obs.]
     The fortitude of the place is best known to you.   --Shak.
  2. That strength or firmness of mind which enables a person to encounter danger with coolness and courage, or to bear pain or adversity without murmuring, depression, or despondency; passive courage; resolute endurance; firmness in confronting or bearing up against danger or enduring trouble.
     Extolling patience as the truest fortitude.   --Milton.
     Fortitude is the guard and support of the other virtues.   --Locke.
  Syn: -- Courage; resolution; resoluteness; endurance; bravery. See Courage, and Heroism.
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  fortitude
       n : strength of mind that enables one to endure adversity with
           courage