The term "la di da" typically refers to a sense of pretentiousness or over-the-top behavior. Its antonyms, therefore, would revolve around concepts such as simplicity, humility, and modesty. Some antonyms that come to mind include words like down-to-earth, unassuming, genuine, and authentic. Other possible antonyms to "la di da" might include words like natural, unpretentious, unsophisticated, and straightforward. These terms all describe behaviors or attitudes that are grounded in reality and avoid excessive showiness or pretension. While "la di da" implies a level of superficiality or insincerity, its antonyms suggest an authentic and relatable approach to life.