rough diamond

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˌrough ˈdiamond noun [countable]  British English informalKIND someone who seems rude, rough, or unfriendly, but is actually nice and generous 外粗内秀的人 SYN American English diamond in the rough

ˌrough ˈdiamond nounChineseSyllable  

rough diamond
ˌrough ˈdiamond noun [countable]
British English informal someone who seems rude, rough, or unfriendly, but is actually nice and generous
   SYN  diamond in the rough American English

rough diamondBrE /ˌrʌf ˈdaɪəmənd/ 🔊NAmE /ˌrʌf ˈdaɪəmənd/ 🔊 (BrE) (NAmE ˌdiamond in the ˈrough) nouna person who has many good qualities even though they do not seem to be very polite, educated, etc. 外粗内秀的人