[mass noun]a feeling of smug or uncritical satisfaction with oneself or one's achievements (对自己或自己的成就)自满,沾沾自喜;满足 the figures are better, but there are no grounds for complacency. 算术有进步,但没有理由自满。
语源
mid 17th cent.: from medieval Latin complacentia, from Latin complacere 'to please'