Disillusionment
noun, verbal noun
The illusion is destroyed. If your illusion is destroyed, that is disillusionment.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
彼氏が道端で立ちションしてるのを見ちゃってさ。もう、完璧に幻滅した。
I saw my boyfriend taking a piss in the street and I was completely disillusioned.
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