Learner's definition of SHAKY
[also more shaky; most shaky]
1 : not strong or steady in movement, sound, etc.: tending to shake because of weakness, strong emotion, etc.
I was so nervous that my hands were shaky. [=shaking, trembling]
She took a few shaky steps before she collapsed.
His voice was shaky.
2 : weak and likely to break down, collapse, or fail
a shaky ladder
The company's future is looking pretty shaky. [=the company's future does not look good]
a shaky economy
Her commitment to the cause seems shaky.
His argument/theory rests on shaky ground. [=his argument/theory is not supported by strong evidence]
Their marriage is on shaky ground.
3 : not impressive or effective
the pitcher's shaky performance
The team has performed better lately after getting off to a shaky start.
My memory of that day is a little shaky. [=I don't remember exactly what happened on that day]