[{"Bold_text": "adjective", "List Items": ["pertaining to rudiments rudimentsor first principles; elementary :a rudimentary knowledge of geometry.Synonyms: initial , fundamental Antonyms: advanced", "Biology.of the nature of a rudiment ;undeveloped or vestigial.Synonyms: embryonic Antonyms: mature", "in an early, imperfect stage or form:How can we improve upon this admittedly rudimentary theory?"]}]