Sentence:  What good would such foolishness do a mountain man? But Pa had been <WSD>adamant</WSD>. Just as he'd been <WSD>adamant</WSD> about their reading, writing, numbers, geography, and languages. Just as he'd been <WSD>adamant</WSD> about using proper grammar 
Meaning of the word marked with <WSD> tags:  (Firm); (unshakeable); (unyielding); (determined).