ungroundedPronunciation: /ʌnˈgraʊndɪd/Definition of ungrounded adjective 1having no basis or justification; unfounded:ungrounded fears 2not electrically earthed: an ungrounded screen can act as an antenna 3 (ungrounded in) not properly instructed or proficient in (a subject or activity). ungrounded in other Oxford dictionaries Definition of ungrounded in the US English dictionary