The word "不已" is formed through a conceptual fusion where the character "不" (not, no) directly negates the core meaning of "已" (to stop, to cease). This combination does not merely list two ideas but creates a new, unified concept where the act of cessation is entirely and emphatically denied, resulting in the abstract sense of something continuing without end or being unable to be stopped. It is the negation of an ending, crystallized into a single term meaning "unceasingly" or "endlessly".