いせい
power; might; authority; influence
Common word
Noun
彼かれ、今いまのところは飛とぶ鳥とりも落おとす勢いきおいだけれど、あの威勢いせいいつまでもつのか、疑問ぎもんだね。
He's unstoppable right now but the question is how long he can remain at the pinnacle of his career.