[{"Bold_text": "adjective", "List Items": ["finely sharpened, as an edge; so shaped as to cut or pierce substances readily:a keen razor.Antonyms: dull", "sharp, piercing, or biting:a keen wind;keen satire.Synonyms: caustic , bitter , cutting", "characterized by strength and distinctness of perception; extremely sensitive or responsive:keen eyes;keen ears.Synonyms: acute , penetrating , piercing", "having or showing great mental penetration or acumen:keen reasoning;a keen mind.Synonyms: clever , shrewd , sagacious , astute , acute , discerning Antonyms: obtuse , dull", "animated by or showing strong feeling or desire:keen competition.", "intense, as feeling or desire:keen ambition;keen jealousy.", "eager ; interested ; enthusiastic ;(often followed byabout, on,etc., or an infinitive):She is really keen on going swimming.Synonyms: fervid , earnest", "Older Slang. great ; wonderful ; marvelous ."]}, {"Bold_text": "noun", "List Items": ["a wailing lament for the dead."]}, {"Bold_text": "verb (used without object)", "List Items": ["to wail in lamentation for the dead."]}, {"Bold_text": "verb (used with object)", "List Items": ["to mourn for by or with such keening or wailing:keening his mother while kneeling at her grave."]}]