mindmap root((顽固)) obstinate implies usually a perverse or unreasonable persistence: a President who was resolute but never ~. dogged suggests a tenacious, sometimes sullen and unwavering, persistence: pursued the story with ~ perseverance. （tenacious紧抓不放的，TEN词根表示hold抓住，如tenure任期表示"hold抓住"职位，又如hold onto your dream like a dog with a bone像狗咬紧骨头一样抓住梦想，形象的说明了dogged和tenacious意思相同，谚语it's dogged that does it天下无难事只怕有心人） stubborn implies innate sturdiness or immovability in resisting attempts to change or abandon a course or opinion: swallow your ~ pride and admit that you are wrong. pertinacious suggests an annoying or irksome persistence: a ~ salesman who wouldn't take no for an answer. mulish implies a settled and thoroughly unreasonable obstinacy: a ~ determination to stick with a lost cause.