The antonyms of *addleheaded* convey a state of mental clarity, alertness, and understanding. Use *clear-headed* to imply rational thinking, *lucid* to suggest a clear explanation, and *unconfused* to convey a lack of ambiguity. These antonyms can be used to express clarity, make informed decisions, and improve writing.

그녀는 모든 장단점을 저울질하는 *명확한* 접근 방식으로 결정을 내렸습니다.

彼女は*明確な*アプローチで決定を下し、すべての長所と短所を比較検討しました。

She made the decision with a *clear-headed* approach, weighing all the pros and cons.

선생님의 설명은 너무나 명료해서 가장 혼란스러워하는 학생들조차도 개념을 이해했습니다.

先生の説明はとても*明快*だったので、最も混乱した学生でさえその概念を理解しました。

The teacher's explanation was so *lucid* that even the most confused students understood the concept.

지침은 *혼란스럽지 않고* 따르기 쉬웠습니다.

指示は*混乱せず*、従うのは簡単でした。

The instructions were *unconfused* and easy to follow.