1. 顽固：perspicacious 敏锐的 | pertinacity 顽固 | persiflage 挖苦

2. 执拗/顽固/顽强：pertinaciously /执拗地/顽固地/ | pertinacity /执拗/顽固/顽强/ | pertinence /适切/妥当/适当/

3. 执拗; 难治愈; 顽固 (名)：pertinacious 执拗的, 顽强的, 顽固的 (形) | pertinacity 执拗; 难治愈; 顽固 (名) | pertinence 有关性; 针对性; 相关性 (名)

1. persistent determination

    Synonym: doggednessperseverancepersistencepersistencytenacitytenaciousness