Source : Webster's Revised Unabridged Dictionary (1913)

Cranky \Crank"y\ (-?), a.
   1. Full of spirit; crank.

   2. Addicted to crotchets and whims; unreasonable in opinions;
      crotchety. [Colloq.]

   3. Unsteady; easy to upset; crank.

Source : WordNet®

cranky
     adj 1: (used of boats) inclined to heel over easily under sail
            [syn: {crank}, {tender}, {tippy}]
     2: easily irritated or annoyed; "an incorrigibly fractious
        young man"; "not the least nettlesome of his countrymen"
        [syn: {fractious}, {irritable}, {nettlesome}, {peevish}, {peckish},
         {pettish}, {petulant}, {testy}, {tetchy}, {techy}]
     [also: {crankiest}, {crankier}]