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

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.

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.

She undiscerningly accepted every compliment, mistaking politeness for genuine admiration.