This is the 9224th most frequent Japanese word.
甘ったる
Overly sweet.
甘ったるい is used to describe the overly sweet nature of one's speech.
彼の言葉はどうにも甘ったるいと感じる。
His words somehow feel overly sweet.
甘ったるすぎ is used to describe an entire item tastes overly sweet, making it overwhelming.
このケーキは甘ったるすぎて、一口で十分だ。
This cake is too sweet; one bite is enough.
甘ったるい indicates the excessive sentimentality present in the movie's scene.