Source : Webster's Revised Unabridged Dictionary (1913)

Hardy \Har"dy\, a. [Compar. {Hardier}; superl. {Hardiest}.] [F.
   hardi, p. p. fr. OF. hardir to make bold; of German origin,
   cf. OHG. hertan to harden, G. h["a]rten. See {Hard}, a.]
   1. Bold; brave; stout; daring; resolu?e; intrepid.

            Hap helpeth hardy man alway.          --Chaucer.

   2. Confident; full of assurance; in a bad sense, morally
      hardened; shameless.

   3. Strong; firm; compact.

            [A] blast may shake in pieces his hardy fabric.
                                                  --South.

   4. Inured to fatigue or hardships; strong; capable of
      endurance; as, a hardy veteran; a hardy mariner.

   5. Able to withstand the cold of winter.

   Note: Plants which are hardy in Virginia may perish in New
         England. Half-hardy plants are those which are able to
         withstand mild winters or moderate frosts.

Source : WordNet®

hardier
     See {hardy}

hardy
     adj 1: having rugged physical strength; inured to fatigue or
            hardships; "hardy explorers of northern Canada";
            "proud of her tall stalwart son"; "stout seamen";
            "sturdy young athletes" [syn: {stalwart}, {stout}, {sturdy}]
     2: resolute and without fear [syn: {doughty}, {fearless}]
     3: able to survive under unfavorable conditions; "strawberries
        are hardy and easy to grow"; "camels are tough and hardy
        creatures"
     n 1: United States slapstick comedian who played the pompous and
          overbearing member of the Laurel and Hardy duo who made
          many films (1892-1957) [syn: {Oliver Hardy}]
     2: English novelist and poet (1840-1928) [syn: {Thomas Hardy}]
     [also: {hardiest}, {hardier}]