The phrase "getting one hair" refers to being precise or meticulous about something. The antonyms, or opposite meanings, of this phrase could include being careless, sloppy, neglectful, or haphazard. These antonyms indicate a lack of attention to detail or a lack of concern for accuracy. They may describe a person who is disorganized, forgetful, or unconcerned with quality. While being meticulous can lead to success and precision, being careless or haphazard can lead to mistakes and errors. Therefore, it is important to consider the level of attention to detail required for a given task and to strive for accuracy and quality in all aspects of life.