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ignorance

2 ENTRIES FOUND:
ignorance /ˈɪgnərəns/ noun
ignorance
/ˈɪgnərəns/
noun
Britannica Dictionary definition of IGNORANCE
: a lack of knowledge, understanding, or education : the state of being ignorant
[noncount]
often + of
[singular]

ignorance is bliss

used to say that a person who does not know about a problem does not worry about it