The word "并不" is formed by combining the character "并", an adverb used for emphasis, with the character "不", the standard negative adverb meaning "not". This creates a compound adverb that strengthens the negation, typically used to contradict a presumed idea or to assert a negative statement with greater force, as in "他并不忙" (He is not busy at all), where "并不" reinforces the denial.