A passage that should be open, with something sitting in it. Air, water, papers, people — whatever was meant to flow through now cannot. The word does not name what is stuck; it names the fact that something is in the way.
obstructive 可以想成一條本來應該通的通道，中間卡著東西。空氣、水、文件、人，本來要通過的現在過不去。這個字不是在講卡住的是什麼，而是在講「有東西擋在那裡」這件事。
From the word’s history
From obstruct plus the adjective ending -ive, which came into English from Latin -ivus by way of Old French. The adjective simply means causing that blocking.
Wiktionary 記錄 obstructive 由 obstruct 加上字尾 -ive 組成，而 -ive 是從拉丁文 -īvus 經古法文進入英文的。-ive 的作用是「帶有這種性質的」。所以整個字的意思很直接：會造成堵塞的。兩個用法都沒有離開這個畫面，只是堵住的地方不一樣。
Wiktionary, packet source_ref kaikki:3f6f69a190036ae4:818330161:8959 — etymology_text: From obstruct + -ive (English -ive from Middle English -yf, Old French -if, Latin -ivus).
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