noun, noun or participle which takes 'suru', intransitive verb
getting stuck in a rut; becoming stereotyped; falling into a pattern
Describes a situation, activity, or relationship that has become repetitive, predictable, and lacking freshness. Often used with する to mean 'to become stale' or 'to get into a rut'.
See also: マンネリ
最近のデートコースがマンネリ化してきた。
Our recent date routines have gotten into a rut.
この番組もマンネリ化が目立つようになった。
This TV show has also started to show signs of becoming stereotyped.