a. 直言无讳的, 坦率的, 坦白无隐的

◆记忆方法一：
out表示“在外”，spoken表示“说”。（什么事都对外说清楚的人是坦率直言的人）

outer/inner/upper/outing/outspoken
记忆：
1. outer [ 5autE ] adj. 外部的, 外面的 The outer walls of the house were made of brick. 房子的外墙是用砖做的
2. inner [ 5inE ] adj. 内部的, 里面的, 内心的 The inner walls of the house was decorated with scenery pictures. 房子的内墙装饰着风景画。
3. upper [ 5QpE ] adj. 上面的, 上部的 The plates on the upper shelf were beyond my reach. 我拿不到放在架子上面的盘子。
4. outing [ 5autiN ] n. 外出, 旅行, 散步 An outing may refresh you. 出去走走可以让你恢复精神。
5. outspoken [ aut5spEukEn] adj. 坦率直言的 Don’t be angry. He is an outspoken person. 别生气。他是个直性子。
另类阅读：
The outspoken man will go outing in Inner Mongolia. He will go to outer space in the upper capsule of the spacecraft next year.