The concept of antonyms for the phrase "more highfalutin" is quite subjective, given that the phrase itself is colloquial and open to interpretation. However, some antonyms that may be used to describe a less fancy or pretentious tone could be "down-to-earth," "unassuming," or "humble." These terms suggest a simplicity, modesty, and lack of affectation; the opposite of what would be conveyed by describing something with the words "more highfaluting." Other antonyms for this phrase could incorporate words such as "plain," "basic," "ordinary," or "simple," all of which connote the opposite of grandiosity, bombast, or ostentation.