complacency

The word 'complacency' originates from the Latin verb complacēre, meaning 'to please greatly', which itself is built from the intensive prefix com- and the root placēre ('to please'). The Latin present participle complacens gave rise to the Late Latin noun complacentia, denoting the state of being very pleased. This concept entered English in the 17th century, initially carrying a neutral sense of simple pleasure or satisfaction. Over time, its meaning narrowed and acquired a negative connotation, specifically referring to a self-satisfied and often unaware state that ignores potential dangers or flaws.

Structure: com (with) + plac (please) + ency (state/quality) com: Latin prefix meaning 'with', 'together', or 'altogether'. It functions as an intensifier here. plac: From Latin placēre, meaning 'to please'. It is the core root conveying the sense of satisfaction. ency: A noun-forming suffix of Latin origin (-entia), indicating a state, quality, or condition.