Wu Collection, Lower Volume
Radical: Stone (shí)
Kangxi Strokes: 12
Page 830, Entry 14
Pronounced keng. The sound of stones colliding.
Records of the Grand Historian (Shiji), Treatise on Music (Yueshu): The sound of the stones is clinking, used to mark the beat.
Annotation: The sound of the stone is decisive and powerful.
Also, in the Extensive Dictionary of Rhymes (Guangyun), the term keng-keng describes the appearance of a person with shallow knowledge.
Analects (Lunyu): A stubborn and shallow person is truly a petty man.
Also used interchangeably with the character jiao.
Book of Jin (Jinshu), Biography of Fan Hongzhi: Although there is a reputation for stubbornness, it is not a noble and elegant style.
Pronunciation and Meaning: The character jiao should be written as keng. Also written as a variant form.
Han Yu's Poetry: How can one hold fast to such stubbornness.
Also, in the Collected Rhymes (Jiyun), the character qing was written as keng in ancient times. Detailed explanation can be found under eleven strokes.