[chí dùn]
slow (in thought or action); obtuse; torpescence; thickness; hebetude; dullness
be slow in reacting; react slowly
反应迟钝
slow of understanding
脑子迟钝
be obtuse [slow] in understanding
理解力迟钝
He has slowed down a lot since his heart attack.
自心脏病发作以来， 他的动作迟钝多了。
You were too obtuse to take the hint.
你太迟钝了， 没有理解这种暗示。