| a. | 1. | Not to be discerned; imperceptible; not discoverable or visible. |
| Adj. | 1. | indiscernible - difficult or impossible to perceive or discern; "an indiscernible increase in temperature" Antonyms: discernable, discernible - perceptible by the senses or intellect; "things happen in the earth and sky with no discernible cause"; "the newspaper reports no discernible progress in the negotiations"; "the skyline is easily discernible even at a distance of several miles" |
| 2. | indiscernible - barely able to be perceived; "the transition was almost indiscernible"; "an almost insensible change" Synonyms: undetectable, insensible |