complacent

Smugly satisfied with oneself or one's achievements, unaware of potential dangers.

• complacency/kəmˈpleɪsənsi/(n)自满
• complacently/kəmˈpleɪsəntli/(adv)自满地

• become complacent
• complacent attitude
• dangerous complacency
• guard against complacency

1. 1.Success can make people complacent, causing them to stop innovating. (too satisfied)
2. 2.The team's complacency after their winning streak led to a shocking defeat. (noun: self-satisfaction)

• self-satisfied/ˌsɛlf ˈsætɪsfaɪd/— pleased with oneself
• smug/smʌɡ/— annoyingly pleased
• unconcerned/ˌʌnkənˈsɜːnd/— not worried

from Latin "complacere" = to please — com- (with) + placere (to please) — too pleased with oneself