clearheaded 词形变化: 形容词: clearable | 副词: clearly | 形容词比较级: clearer | 形容词最高级: clearest | 名词: clearer | 动词过去式: cleared | 动词过去分词: cleared | 动词现在分词: clearing | 动词第三人称单数: clears | 同义词: clear-thinking | 反义词: confused |