Added 9 October 2026 well-grounded adjective Categories: Describing WordsObscure Words adjective ! Definition from WordNet 3.1, Princeton University. More about well-grounded at Wordnik → Where our words come from → Logically valid. a sound argument Related Words: reasonedvalidsoundwell-informedinformedwell-foundedjustifiedjustifiablelegitimatewell-establishedstrongsolid Back to today's word