What is the meaning of shaky?

adjective

• Inclined to shake as from weakness or defect.
  • usage: "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"
  • synonyms: rickety, wobbly, wonky
• Vibrating slightly and irregularly; as e. G. With fear or cold or like the leaves of an aspen in a breeze.
  • usage: "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"
  • synonyms: shivering, trembling
• Not secure; beset with difficulties.
  • usage: "a shaky marriage"
  • synonyms: precarious