hardheaded in WordNet English dictionary

1. guided by practical experience and observation rather than theory
   "a hardheaded appraisal of our position"; "a hard-nosed labor leader"; "completely practical in his approach to business"; "not ideology but pragmatic politics"
   hardheaded  hard-nosed  practical  pragmatic 
   
2. unreasonably rigid in the face of argument or entreaty or attack
   hardheaded  mulish 
   

hardheaded in English Wiktionary