[{"Bold_text": "adjective", "List Items": ["showing a decline or deterioration of physical strength or mental functioning, especially short-term memory and alertness, as a result of old age or disease.", "of or belonging to old age or aged persons; gerontological; geriatric.", "Physical Geography.(of topographical features) having been reduced by erosion to a featureless plain that stands everywhere at base level.Compare peneplain ."]}, {"Bold_text": "noun", "List Items": ["a senile person."]}]