noun, noun which may take the genitive case particle 'no'
ignorance; stupidity; ignorant person; stupid person
Refers to a lack of knowledge or common sense, often used critically or self-deprecatingly. Can describe a person or the quality itself.
Saying something like that, he is completely ignorant.
I embarrassed myself because of my ignorance.
馬鹿 is a stronger, more direct insult meaning 'fool' or 'idiot', while 物知らず is milder and focuses on ignorance rather than general stupidity.
物知らず describes someone who lacks basic knowledge or common sense, the direct opposite of a 物知り who knows a great deal.
foolhardy; reckless; fearless
Full kanji spelling; standard and widely used.
Common mixed kanji-kana spelling.
Rarely used kanji form; 識 is an older character for 'know'.
Compound of 物 (thing) + 知らず (negative of 知る, to know), literally 'not knowing things'. The exact historical derivation is straightforward.