pronoun
Used in negative, conditional, or rhetorical contexts to mean 'no matter who' or 'any person at all'. Often appears in formal or emphatic statements.
何人たりとも、この部屋に入ってはいけない。
No one, whoever they may be, is allowed to enter this room.
この問題は、何人にも解けないだろう。
This problem probably cannot be solved by anyone.
Mixed kanji-kana spelling that clarifies the reading なにびと.
Compound of 何 (nani, 'what') and 人 (hito, 'person'), with rendaku voicing in some readings. The reading なんぴと is a further sound change from なんびと.