Abnormal, Transformation, Metamorphosis
Noun, する verb, and の adjective
へんたい
実は、ちょっと恥ずかしい話なんだけど、俺の親父めちゃくちゃ変態で、児童ポルノの一斉捜査で捕まっちゃったんだよね。
Actually, it’s sort of an embarrassing story, but my father is so perverted that he was caught in a massive child porn ring.
Your appearance is strange. You're abnormal. Oh, and you're a pervert because you look so abnormal. Though you could just be a caterpillar going through your metamorphosis to become a butterfly. You just look really weird while the changing is going on.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.