Being out of keeping or being incongruous are two antonyms for the phrase "being in keeping". Being in keeping means being consistent or harmonious with a certain style or mood, while being out of keeping implies the opposite. Incongruous, on the other hand, means being inappropriate or not fitting with the context or surroundings. It is important to understand antonyms as they help to clarify the meaning of a word or phrase by providing its opposite. By knowing antonyms, we can better understand the nuances of language and express ourselves more precisely.