noun
indefinite pronoun
A grammatical term for pronouns that refer to non-specific persons or things, such as 'someone' or 'anything'.
「誰か」や「何か」は不定代名詞の例です。
'Someone' and 'something' are examples of indefinite pronouns.
代名詞 is the general term for 'pronoun', while 不定代名詞 specifically refers to indefinite pronouns.
Compound of 不定 (indefinite) and 代名詞 (pronoun), a direct calque from English 'indefinite pronoun' or similar Western grammatical terminology.