false-negative

adjective
variants: or false negative

Medical Definition of false-negative 

: relating to or being a test or an individual that is erroneously classified in a negative category (as of diagnosis) because of imperfect testing methods or procedures … any false-negative smears would again underestimate the prevalence of abnormal test results.— Jeanne Mandelblatt et al., The Journal of the American Medical Association, 18 July 1986 — compare false-positive

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