undetectable
/ˌʌn.dɪˈtɛk.tə.bəl/ · un·de·tect·a·ble
adjective
- Unable to be detected; not detectable. The spy used an undetectable tracking device that left no trace.
- So small or subtle that it escapes observation or measurement. The virus was present at an undetectable level in the blood sample.
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Did you know? In HIV treatment, patients whose viral load is 'undetectable' cannot transmit the virus sexually, a milestone known as U=U (Undetectable = Untransmittable).