ignorance /ˈɪgnərəns/ noun Learner's definition of IGNORANCE
: a lack of knowledge, understanding, or education : the state of being ignorant无知；愚昧 [noncount]
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often + of -
Ignorance of the law is no excuse (for violating it).对法律的无知不是（违反法律的）借口。
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Their decisions were made in ignorance of [=without knowing] the true nature of the situation.他们还不清楚实际情况便做了决定。
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When asked about the reasons for these drastic changes, she pleaded/pled ignorance. [=she said that she did not know the reasons]被问到这些剧变的原因时，她说自己不清楚。
[singular]
ignorance is bliss
— used to say that a person who does not know about a problem does not worry about it无知是福