The phrase "one for the book" refers to a memorable or exceptional event or achievement. Antonyms, on the other hand, are words that have opposite meanings. Opposite expressions to "one for the book" may include "forgettable," "ordinary," "unremarkable," or "undistinguished." If a situation is "run-of-the-mill" or "nothing to write home about," it would be the complete opposite of "one for the book." Synonyms for unexceptional occurrences could be "commonplace," "mundane," or "routine." Antonyms for "one for the book" can help describe a situation where nothing stands out, and it is an unremarkable situation.