because this word is from China. But don’t forget that Japan is a independent nation, japanese needed to talk before they touched China, so they had created thousands of words before they could learn from China.凄（sugo,qi1）强（tsuyo,qiang2）人（hito,ren2）夜（yoru,ye4）最(motto,zui4）they are completely different right?and you must learn this words at startup. when you finally find out the original words and grammars, you can learn many advanced words from China.