adj.顽固的，头脑冷静的，精明而讲实际的，实事求是的，愚蠢的，固执的

He's so hardheaded that he refuses to listen to anyone else's opinions.
他非常固执，拒绝听取别人的意见。
My sister can be really hardheaded when it comes to her career choices.
在职业选择上，我妹妹真是个顽固的人。
The coach was known for being hardheaded, sticking to his game plan no matter the situation.
教练以固执著称，无论情况如何都坚持他的比赛计划。
It's hard to convince him otherwise; he's just too hardheaded.
很难说服他改变主意，他实在太固执了。
Despite numerous warnings, the hardheaded entrepreneur continued to invest in the failing venture.
尽管多次警告，这位固执的企业家仍继续对那个失败的项目进行投资。
She's got a hardheaded approach to problem-solving, always insisting on facts and logic.
她解决问题的方法很实际，总是坚持事实和逻辑。
The hardheaded manager refused to budge on the budget cuts, stating that it was necessary for the company's survival.
这位固执的经理拒绝在预算削减上让步，声称这对公司生存是必要的。
My grandfather is quite hardheaded about traditional values; he believes they should never be compromised.
我祖父对传统价值观非常固执，他认为这些价值观绝不应该妥协。
Dealing with a hardheaded client can be frustrating; negotiations often feel like talking to a wall.
与固执的客户打交道可能会令人沮丧；谈判往往感觉像是对牛弹琴。
The hardheaded detective wouldn't let go of the case until every lead was thoroughly investigated.
那位固执的侦探不把所有线索彻底调查清楚就不放弃这个案件。