A "crash project" refers to a project that is executed with extreme urgency and intense focus to meet a tight deadline. Antonyms for this phrase could include words like leisurely, relaxed, or unhurried, which suggest a lack of urgency or commitment. A project that is considered a "slow burn" would be the opposite of a "crash project," as it entails a slow and steady approach to completing tasks over an extended period. Another antonym could be "unimportant," as a crash project is usually considered significant and high-priority, while an unimportant project would have less critical deadlines and less urgency attached to it.