The word 阻碍 is formed through the combination of two independent characters, 阻 and 碍, which each carry a core meaning related to obstruction. 阻 primarily conveys the idea of blocking or hindering a path or progress, often with a physical or tangible connotation, while 碍 conveys a sense of an obstacle or impediment that causes trouble or interference. When paired, they create a compound word where their meanings converge and reinforce each other, forming a unified concept that denotes an obstruction or hindrance that prevents movement, action, or development, blending both the tangible and intangible aspects of being impeded.