unperceivableadjective · Level 3 SAT1impossible or difficult to perceive by the mind or sensesThe shift in atmospheric pressure was unperceivable to anyone without instruments.ModuleLevel 3Registeracademic, contrastCollectionCollection 049SAT Complete planAlso in Collection 049avertible, impermanent, swinish, sensible, obese, exultant, imperviable, insatiate and 1 more