infelicity
/ˌɪnfɪˈlɪsɪtɪ/noun
(pl. -ies)
1- a thing that is inappropriate, especially a remark or expression不恰当的事物（尤指言谈或措辞）：
she winced at their infelicities and at the clumsy way they talked.
她对他们的不当言谈和拙劣的说话方式皱眉头。
1.1
- mass noun archaic unhappiness; misfortune〈古〉不快; 不幸。
词源
late Middle English （in the sense 'unhappiness'）: from Latin infelicitas, from infelix, infelic- 'unhappy', from in- 'not' + felix 'happy'.