Sentence:  ... the junior Osborne was quite as <WSD>obstinate</WSD> as the senior: when he wanted a thing, quite as firm in his resolution to get it; and quite as violent when angered, as his father in his most stern moments 
Meaning of the word marked with <WSD> tags:  Stubbornly adhering to an opinion, purpose, or course, usually with implied unreasonableness; persistent.