The phrase "nuts-and-bolts" typically refers to the basic or essential practical details of something. In the context of antonyms, the opposite of "nuts-and-bolts" would be anything that is abstract, theoretical, or conceptual. Some possible antonyms for "nuts-and-bolts" could include words like theoretical, mathematical, philosophical, speculative, abstract, conceptual, or metaphysical. These terms suggest a more intellectual or theoretical focus, rather than a practical or concrete one. While "nuts-and-bolts" tends to imply a focus on practicality and pragmatism, its antonyms suggest a focus on creativity, imagination, and intellectual exploration.