on shaky ground

on shaky ground

Questionable or lacking support, as of an idea. His hypothesis has been on shaky ground to since the beginning, so I'm not surprised that he couldn't prove it in the lab.
See also: ground, on, shaky

on shaky ground

 and on dangerous ground
Fig. [of an idea or proposal] on an unstable or questionable foundation; [of an idea or proposal] founded on a risky premise. When you suggest that we are to blame, you are on shaky ground. There is no evidence that we are at fault. The case for relying solely on nuclear energy seems to be on dangerous ground.
See also: ground, on, shaky
References in periodicals archive ?
However, in some chapters the authors have drawn excessively on anecdotal and dated research thus leaving parts of their argument on shaky ground.