Home › Words › U › underascertainmentunderascertainmentunderascertainment means insufficient ascertainment.Among words judged in Lexicurio's Arena, underascertainment ranks #41,618 of 42,747 for Qualifying.EtymologyFrom under- + ascertainment.nounInsufficient ascertainmente.g.“Further, some household contacts with symptoms may not have returned with the contact slip, leading to underascertainment of contacts examined and possible TB cases detected.” — 2015 July 6, Kshitij Khaparde et al., “Evaluation of TB Case Finding through Systematic Contact Investigation, Chhattisgarh, India”, in Tuberculosis Research and Treatment, volume 2015, →DOI:Definitions & examples from Wiktionary (CC BY-SA 3.0).