| Term | Definition |
| bitterness, discord | acrimony- Though they vowed that no girl would ever come between them, Biff and Trevor could not keep acrimony from buliding up. |
| keen insight | acumen- because of his mathematical acumen, Lary was able to figure out in minutes problems that took other students hours |
| sharp, severe | acute- Arnold could not walk because the pain in his foot was so acute |
| having keen insight | acute- Because she was so acute, Libby instntly figured out how the magician pulled off his "magic" |
| impervious, immovable, unyielding | adamant- though public pressure was intense, the president remained adamant about his proposal |
| extremely skilled | adept- Tarzan was adept at jumping from tree to tree like a monkey. |