The Chinese word 疏忽 (shūhū), meaning "negligence" or "carelessness", is a synonymous compound formed by combining two characters with closely related meanings to reinforce a single concept. The first character, 疏 (shū), carries the sense of being distant, lax, or inattentive, while the second, 忽 (hū), means to neglect, overlook, or be reckless. When paired, their semantic fields overlap and intensify, creating a single, cohesive term that vividly conveys the idea of a failure to pay proper attention due to oversight or laxity. This formation is a classic example of how modern Chinese vocabulary often builds precise abstract nouns from simpler, concrete morphemes.