What is the meaning of thickheaded?

adjective

7
 
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APAWordNet. (2010). thickheaded. Retrieved April 27, 2017, from http://smartdefine.org/thickheaded/definitions/1185296
ChicagoWordNet. 2010. "thickheaded" http://smartdefine.org/thickheaded/definitions/1185296 (accessed April 27, 2017).
HarvardWordNet 2010, thickheaded, Smart Define, viewed 27 April, 2017, <http://smartdefine.org/thickheaded/definitions/1185296>.
MLAWordNet. "thickheaded" 23 October 2010. Web. 27 April 2017. <http://smartdefine.org/thickheaded/definitions/1185296>