dumb

unable to speak because of hereditary deafness

由于遗传性耳聋不能说话

mute

silent

lacking the power of human speech

缺乏人类语言的力量

dumb animals

哑巴动物

temporarily incapable of speaking

暂时不能说话

struck dumb

speechless with shock

speechless

slow to learn or understand

学习或理解缓慢

lacking intellectual acuity

缺乏智慧

so dense he nr understands anything I say to him

他太笨了，我对他说什么他都不懂

nr met anyone quite so dim

从没见过这么阴暗的人

although dull at classical learning, at mathematics he was uncommonly quick"- Thackera

虽然在古典学习上很枯燥，但在数学上却异常敏捷。——萨克拉

dumb officials make some really dumb decisions

愚蠢的官员会做出一些愚蠢的决定

he was either normally stupid or being deliberately obtuse

他不是很笨就是故意装傻

worked with the slow students

和慢学生一起工作

dense

dim

dull

obtuse

slow