nondetectable
Below sensing threshold
Nondetectable means unable to be detected or measured, falling below the threshold of observation.
In medical contexts, a nondetectable viral load indicates the virus has been suppressed to levels too low for standard tests to measure: After six months of treatment, his HIV was nondetectable.
The term appears in scientific and technical writing where precise measurement matters.
Cannot be seen
- imperceptibleCannot be sensed
- untraceableImpossible to follow back
- hiddenKept out of sight
- concealedMade invisible deliberately
covert · stealthy · unnoticeable · indiscernible · camouflaged · masked · disguised · unobservable
Below symptom detection level
- asymptomaticDiseased without outward signs
- undiagnosedNot yet medically named
- screeningEvaluative selection process
- biomarkerMeasurable biological health signal
threshold · sensitivity · trace · dormant · latent · remission · microscopic · occult
Act of escaping detection
- stealthSecret, undetected movement
- countermeasureDefense against a threat
- jammingBlocking or wedging forcefully
- spoofingFraudulent imitation
encryption · anonymity · untraceable · off-grid · burner · scrambled · cloaked · underground
Harmful computer programs
- rootkitHidden unauthorized access software
- spywareHidden surveillance program
- zero-dayUnpatched security vulnerability
- backdoorHidden bypass mechanism
exploit · antivirus · firewall · sandbox · encryption · obfuscation · polymorphic · fileless
Under a set limit
- calibrationAdjusting for measurement accuracy
- resolutionFormal decision or determination
- baselineStandard for comparison
- measurementDetermining size or amount
precision · assay · spectroscopy · chromatography · nanoscale
invisible
Cannot be seen
- imperceptibleCannot be sensed
- untraceableImpossible to follow back
- hiddenKept out of sight
concealed · covert · stealthy · unnoticeable · indiscernible · camouflaged · masked · disguised · unobservable · latent
subclinical
Below symptom detection level
- asymptomaticDiseased without outward signs
- undiagnosedNot yet medically named
- screeningEvaluative selection process
biomarker · threshold · sensitivity · trace · dormant · latent · remission · microscopic · occult · benign
evasion
Act of escaping detection
- stealthSecret, undetected movement
- countermeasureDefense against a threat
- jammingBlocking or wedging forcefully
spoofing · encryption · anonymity · untraceable · off-grid · burner · scrambled · cloaked · underground · alias
malware
Harmful computer programs
- rootkitHidden unauthorized access software
- spywareHidden surveillance program
- zero-dayUnpatched security vulnerability
backdoor · exploit · antivirus · firewall · sandbox · encryption · obfuscation · polymorphic · fileless · signature
below-threshold
Under a set limit
- calibrationAdjusting for measurement accuracy
- resolutionFormal decision or determination
- baselineStandard for comparison
measurement · precision · assay · spectroscopy · chromatography · nanoscale
nondetectabledetectable
Capable of being noticed
perceivable · noticeable · identifiable · observable · discernible
detect, detectable, detected, detecting, detection, detective, detector, detects, undetectable