The antonyms for the word "spaced-out" include words that are opposite in meaning to being spaced out or disconnected from reality. These words are focused, alert, attentive, aware, and sharp. If someone is focused, they are paying attention to the task at hand and are not distracted. Alert individuals are highly aware of their surroundings and can react quickly to any changes in their environment. Meanwhile, attentive people are highly alert and observant and can pick up on crucial details. Being aware means that someone has a clear understanding of what is going on around them, while being sharp indicates intellect and quick thinking.