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indiscernible (adj.)

1630s, from in- (1) "not, opposite of" + discernible. Related: Indiscernibly; indiscernibility.

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Definitions of indiscernible from WordNet

indiscernible (adj.)
difficult or impossible to perceive or discern;
an indiscernible increase in temperature
indiscernible (adj.)
barely able to be perceived;
the transition was almost indiscernible
From wordnet.princeton.edu