The word "crackups" refers to situations that cause laughter or amusement. Antonyms for this word would be situations that elicit negative emotions such as sadness, anger, or frustration. These could include tragedies, disasters, or conflicts that produce tears, despair, or even rage among those affected. Alternatively, quiet or dull moments that fail to ignite excitement or joy could also be considered antonyms for "crackups." For instance, a boring lecture, tedious book, or unremarkable event could all be deemed "non-crackups." In contrast to the fun and energetic vibe of "crackups," these antonyms represent the opposite end of the emotional spectrum.