The term "high falutin" typically refers to someone or something that is pretentiously fancy, boastful or exaggeratedly sophisticated. Some antonyms that could be used to describe the opposite of this kind of behavior or attitude might include down-to-earth, modest, humble, unassuming, straightforward, simple, honest, genuine or unpretentious. Additionally, words like basic, plain, ordinary or uncomplicated could also be used to contrast the flashy or show-offy nature of high falutin behavior. Ultimately, the use of antonyms can provide readers with a clearer understanding of the meaning and context of the word "high falutin" by offering a range of alternatives that can help to define its meaning in various ways.