If you refer to a dysfunction in something such as a relationship or someone's behaviour, you mean that it is different from what is considered to be normal.
例句
...his severe emotional dysfunction was very clearly apparent.显而易见他情绪严重异常。
N-VAR
机能障碍
If someone has a physical dysfunction, part of their body is not working properly.
例句
...kidney and liver dysfunction.肝肾功能失调
英汉词典释义
n.
机能障碍,机能失调
neurological dysfunction神经机能障碍
英英词典释义
Noun
1. (medicine) any disturbance in the function of an organ or body part