Definitions of shaky:

• adjective:   not secure; beset with difficulties

  Example: "A shaky marriage"

• adjective:   inclined to shake as from weakness or defect

  Example: "A wobbly chair with shaky legs"

• adjective:   vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze

  Example: "Seemed shaky on her feet"