The antonyms for the phrase "more la-dee-da" can include words like humble, unpretentious, simple, modest, down-to-earth, and plain. These antonyms describe qualities that are modest, unassuming, and lack extravagance. They are the opposite of having a showy or flashy demeanor, and instead, focus on being genuine and unassuming. These characteristics can often be associated with a lack of material possessions or status, but they convey a sense of sincerity and honesty. While "la-dee-da" may suggest a frivolous, ostentatious demeanor, the antonyms for this phrase represent an entirely different set of values, emphasizing modesty and putting one's values ahead of material possessions.