The undiscerned cause of the illness frustrated the medical team.

The artist blended the colors undiscernibly, so the boundary between them vanished.

The undiscernibleness of the markings on the artifact puzzled the archaeologists, who struggled to interpret their purpose.

The undiscerning tourist bought a counterfeit watch without noticing its flaws.

By candlelight the old manuscript's script remained undiscernable, frustrating even the most patient scholars.

The scholar noted that in older manuscripts the word appeared as undiscernible, an archaic spelling that puzzled modern readers.

He moved undiscernedly through the crowded market, taking notes without attracting attention.