I.
n.
Quack, charlatan, pretender, mountebank, impostor, cheat, mere experimenter (without scientific training).
II.
a.;
(also empirical)
1.
Experimental, experiential, from experience (as distinguished from inference or reasoning), based on evidence of the senses (in opposition to the creations of reason).
2.
Tentative, provisional, hypothetical, experimental, that feels its way, awaiting verification.
3.
Charlatanic, quackish.