
1) About to collapse 2) Beset with difficulties 3) Dubious 4) Inconstant 5) Insecure 6) Kind of ground some stand on 7) Less than stable 8) Like those with the yips 9) Likely to fall 10) Not secure 11) Precarious 12) Questionable 13) Rickety 14) Tenuous 15) Trembling 16) Uncertain 17) Unsafe 18) Unsound 
Found on 
https://www.crosswordclues.com/clue/shaky

1) Aguish 2) Cranky 3) Faint 4) Insecure 5) Jerky 6) Palsied 7) Quaking 8) Quivering 9) Rickety 10) Shaking 11) Shivering 12) Tenuous 13) Tired 14) Trembling 15) Tremorous 16) Twittery 17) Unsafe 18) Unstable 19) Unsteady 20) Unsure 21) Weak 22) Wobbly 
Found on 
https://www.crosswordclues.com/clue/shaky

• (superl.) Full of shakes or cracks; cracked; as, shaky timber. • (superl.) Shaking or trembling; as, a shaky spot in a marsh; a shaky hand. • (superl.) Easily shaken; tottering; unsound; as, a shaky constitution; shaky business credit.
Found on 
http://thinkexist.com/dictionary/meaning/shaky/
 Shak'y  adjective
Shak'y  adjective [ 
 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....
Found on 
http://www.encyclo.co.uk/webster/S/80

Shaky is slang for risky, precarious, dangerous, improbable, undependable.
Found on 
http://www.probertencyclopaedia.com/browse/ZSA.HTM
 shivering adjective
shivering adjective 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 ...
Found on 
https://www.encyclo.co.uk/local/20974
  No exact match found.