acid test Synonyms

trial appraisal of worth crucial appraisal foolproof test infallible test party with acid drugs party with drugs rigorous appraisal stiff test test giving incontestable result test to establish genuineness appraisal of value appraisal of quality litmus test test case critical appraisal conclusive test final test decisive test serious test rigorous test severe test very thourough test test to establish quality