一窍不通
一窍不通一窍不通[yī qiào bù tōng]1.■be utterly ignorant of; an absolute blockhead; be a complete ignoramus; can't see sense; impenetrably dull; it's all Greek to sb.; know nothing of [about]; lack the slightest knowledge of; not to know the ABC of; not to know the first thing about; stupid; unintelligent:我对原子核物理学一窍不通。I'm out of my depth when it comes nuclear physics.
