The antonyms for the term "more feather-brained" can be focused, intelligent, smart, wise, clever, and bright. These antonyms indicate the opposite of being bird-brained, scatterbrained, and lacking in mental acuity. If someone is described as feather-brained, it generally means that they are not paying attention or are easily distracted. However, if they are intelligent or focused, they are sharp and quick-witted, making them the exact opposite of being feather-brained. These antonyms show the importance of having a sharp mind that is always alert, always ready, and always focused on the task at hand.