Adjective: indiscernible ,in-di'sur-nu-bul
- Difficult or impossible to perceive or discern
"an indiscernible increase in temperature"
- Barely able to be perceived
"the transition was almost indiscernible";
- insensible, undetectable
See also: imperceptible, unperceivable
Antonym: discernable
Encyclopedia: Indiscernible