Deepenings are defined as the process of becoming deeper, or the deeper parts of something. Antonyms for deepening could include words that express shallowness or lack of depth. This could include words such as surface, superficiality, or superficialness, which all suggest a lack of depth. Alternatively, words like flattening, leveling out, or smoothing over could also be considered antonyms for deepening, as they suggest a process of making something shallower or less deep. Other possible antonyms might include words like scaling back, reducing, or downsizing, as these suggest a process of making something smaller or less significant. Overall, antonyms for deepening are words that express the opposite of becoming deeper, and instead suggest a process of shallowing, reducing or diminishing.