妨碍 (fáng'ài) is a verb meaning 'to hinder', 'to impede', or 'to obstruct' — something that interferes with the normal progress, function, or development of a person, process, or system. The first character 妨 (fáng) originally meant 'to harm' or 'to cause trouble', while 碍 (ài) means 'to block' or 'to obstruct'; together, they form a compound emphasizing active interference. It's commonly used in formal, written, or semi-formal contexts — especially in discussions about health, law, logistics, education, or public policy.

This word often appears in passive constructions (e.g., 被...妨碍) or with subjects like noise, illness, bureaucracy, or poor planning. Unlike more casual synonyms like 挡 (dǎng), 妨碍 implies a measurable negative effect on efficiency, safety, or well-being. It rarely describes minor inconveniences; instead, it signals a meaningful disruption requiring attention or correction.