Source : Webster's Revised Unabridged Dictionary (1913)

Shaky \Shak"y\, a. [Compar. {Shakier}; superl. {Shakiest}.]
   1. Shaking or trembling; as, a shaky spot in a marsh; a shaky
      hand. --Thackeray.

   2. Full of shakes or cracks; cracked; as, shaky timber.
      --Gwilt.

   3. Easily shaken; tottering; unsound; as, a shaky
      constitution; shaky business credit. [Colloq.]

Source : WordNet®

shaky
     adj 1: inclined to shake as from weakness or defect; "a rickety
            table"; "a wobbly chair with shaky legs"; "the ladder
            felt a little wobbly"; "the bridge still stands though
            one of the arches is wonky" [syn: {rickety}, {wobbly},
             {wonky}]
     2: vibrating slightly and irregularly; as e.g. with fear or
        cold or like the leaves of an aspen in a breeze; "a
        quaking bog"; "the quaking child asked for more";
        "quivering leaves of a poplar tree"; "with shaking knees";
        "seemed shaky on her feet"; "sparkling light from the
        shivering crystals of the chandelier"; "trembling hands"
        [syn: {quaking}, {quivering}, {shaking}, {shivering}, {trembling}]
     3: not secure; beset with difficulties; "a shaky marriage"
        [syn: {precarious}]
     [also: {shakiest}, {shakier}]