complacent (adjective)

1. In the novel, the main character's complacent attitude towards his success leads to his downfall.

2. The fashion designer's complacent approach to her designs resulted in repetitive and uninspired collections.

3. The complacent protagonist initially underestimates the challenges he faces in the anime series.

4. The couple became complacent in their relationship, taking each other for granted and failing to make efforts to keep the romance alive.