shak·y 
(shākē)
(shākē)adj. shak·i·er, shak·i·est
1. Trembling or quivering; tremulous: a shaky voice.
2. Lacking soundness or sturdiness, as of construction: a shaky table.
3.
a. Not to be depended on; precarious: a shaky alliance.
b. Wavering in firmness: a shaky belief.
c. Open to question or doubt: shaky evidence.
shaki·ly adv.
shaki·ness n.