マンネリ

noun, noun which may take the genitive case particle 'no'

stuck in a rut; stereotyped; humdrum

Abbreviation of マンネリズム (mannerism). Used for situations, relationships, or creative work that have become stale, repetitive, or lacking freshness. Often appears as マンネリ化する or マンネリになる.

See also: マンネリズム

• 最さい近きん、仕し事ごとがマンネリ化かしてきた。

  Lately, my work has become routine and stale.