GMAT Vocabulary Flash Cards @ englishpdf.com and englishteststore.com File 016 acumen (n) Quickness of intellectual insight, or discernment; keenness of discrimination acute (adj) Having fine and penetrating discernment adage (n) an old saying now accepted as being truthful adamant (n) Any substance of exceeding hardness or impenetrability addendum (n) Something added, or to be added addle (v) To make inefficient or worthless; muddle addled (adj) rotten adduce (v) To bring forward or name for consideration