smug

the word 'smug' entered english in the mid-16th century from low german or dutch dialects, carrying the original sense of 'neat, spruce, or smart' in appearance. this early meaning is preserved in regional germanic languages, such as the frisian 'smuk' for pretty. over time, the english usage shifted from describing a polished external appearance to characterizing an attitude of self-satisfaction and complacency. the modern, pejorative sense of being offensively pleased with oneself evolved by the late 17th century, illustrating a semantic drift from an admired external quality to a criticized internal state of conceit.

this word is a simplex form. it is a loanword from low german or dutch, related to the middle low german 'smuk' meaning pretty or elegant, and the middle dutch 'smuc' meaning neat or stylish.