Antonyms of adj undetected

1 sense of undetected

Sense 1
undetected (vs. detected) -- (not perceived or discerned; "they feared some undetected trace of poison"; "she looked around to be sure her faux pas was undetected")

detected (vs. undetected) -- (perceived or discerned; "the detected micrometeoritic material")
        => perceived -- (detected by means of the senses; "a perceived difference in temperature")
        => sensed, perceived -- (detected by instinct or inference rather than by recognized perceptual cues; "the felt presence of an intruder"; "a sensed presence in the room raised goosebumps on her arms"; "a perceived threat")
        => heard -- (detected or perceived by the sense of hearing; "a conversation heard through the wall")

Similarity of adj undetected

1 sense of undetected

Sense 1
undetected (vs. detected) -- (not perceived or discerned; "they feared some undetected trace of poison"; "she looked around to be sure her faux pas was undetected")
       => undiscovered -- (not discovered; "with earth-based telescopes many stars remain undiscovered")
       => unobserved, unseen -- (not observed)