你知道“知道”嘛？知道的话，下面的词根很简单滴。
know-kno-gno-comgno-cogn cooperate

gno=cogn
ignore[iɡ'nɔ:]
to pay no attention to sth
to pretend that you have not seen sb or that sb is not there
vt.不顾；忽视；不理睬; 驳回诉讼

例句
Nobody could ignore these problems.
没有谁会忽视这些问题。
The baby felt ignored by her parents.
那个婴儿感到被父母忽视了。

耶鲁公开课 - 旧约导论课程节选
At this point in the story, perhaps the view is that all know of God even if they ignore him.
从这点来看,即使每个人都忽略上帝，但都知道上帝的存在。

ignorant ['iɡnərənt]
~ (of / about sth) lacking knowledge or information about sth; not educated
(informal) with very bad manners
caused by a lack of knowledge and understanding
adj. 无知的；愚昧的；没有受教育的；很无礼的，十分不懂规矩的；无知造成的;显示无知的

例句
His ignorant behaviour at the dinner table caused much embarrassment.
他在餐桌上举止粗鲁，在座的人颇为难堪。
She regarded her critics as ignorant and prejudiced.
她认为那些批评她的人既无知又存有偏见。

diagnose['daiәgnәuz] dia穿过 穿过皮肤才知道
to recognize and name the exact character of a disease or a problem, by making an examination
v 诊断；断定；调查分析或断定(动乱、故障或问题等)的原因(或性质)：

例句
The doctor diagnosed the illness as pneumonia.
医生诊断此病为肺炎。
He diagnosed the trouble that caused the engine knock.
他查出了引起发动机发出爆震声故障的原因。

prognosis[prɔɡ'nəusis]
FORMAL a doctor's judgment of the likely or expected development of a disease or of the chances of getting better:
a statement of what is judged likely to happen in the future, especially in connection with a particular situation
n.预测； [医]预知

例句
The prognosis depends on the source of the vertigo.
对于病情的预判要视形成眩晕的原因而定。
The prognosis for the economy is uncertain.
对经济的前景预测还不确定。

agnostic[æɡ'nɔstik]
One who believes that there can be no proof of the existence of God but does not deny the possibility that God exists
Relating to or being an agnostic
【哲学】n. 不可知论者（相信无法证实上帝的存在但又不否认上帝存在可能性的人）
adj. 不可知论(者)的