不

不 is one of the oldest characters in Chinese writing.

The exact origin of 不 is uncertain. In oracle-bone and bronze inscriptions, 不 appears as a simple pictographic form, likely representing a concrete object and later borrowed phonetically to express negation.

Over time, its original concrete meaning disappeared, and 不 became purely grammatical, functioning as a general negative marker.

Unlike most characters, 不 does not retain a clear semantic radical–phonetic structure in its modern usage.

Shuowen Jiezi (説文解字) describes it as a bird flying upward and not descending — interpreted as “not returning,” hence “not.”

Other theories:

- flower calyx (柎의 본자);

- plant root representation.

不 is primarily a negating adverb or prefix, used to deny:

- actions

- states

- qualities

- existence (in certain contexts)

It is placed before verbs, adjectives, or verb phrases.

It is one of the most basic and frequently used negation characters in Classical and Modern Chinese, as well as in Korean and Japanese.

Common compounds:

불가 (不可) — impossible

불법 (不法) — illegal

불필요 (不必要) — unnecessary

불만 (不滿) — dissatisfaction

불행 (不幸) — misfortune

不 is part of a family of negative characters with slightly different nuances:

無 — not, none, does not exist (absolute absence, like no / none);

未 — not yet (temporal negation, e.g. 未來 “future” = not yet come);

弗 — originally “not,” but rarely used now except in words like 弗 (dollar) or 불소 (fluoride);

非 — wrong / not in accordance with (denial of category or quality; implies wrongness);

否 — to refuse, to reject (used when actively saying “no” or recording rejection, e.g. 가/부 표 in voting);

勿 — must not (prohibition).

Among these, 不 is the most general-purpose and neutral negative marker.

Classical citations:

《論語》 (The Analects)

「知之為知之，不知為不知」

“To know what you know, and to say you do not know what you do not know.”

《孟子》 (Mencius)

「不可不察也」

“It cannot be left unexamined.”