The antonyms of "more boneheaded" are intelligent, smart, sensible, astute, and ingenious. Calling someone boneheaded indicates their lack of wit, wisdom, or good judgment. A person's behavior or decisions that are boneheaded often lead to negative consequences. Conversely, intelligent, astute, and clever refer to individuals with a high degree of intellectual ability, sharpness, and ability to adapt to new situations. Smart, on the other hand, refers to practical intelligence, being quick to catch on or to understand something. Finally, ingenious means having exceptional creativity or resourcefulness, and therefore finding innovative solutions to problems. By using one of these antonyms instead of boneheaded, we can convey a clearer and more precise meaning.