Obstinacious is a dated American regional variant of 'obstinate', meaning stubbornly persistent in refusing to change one's position or comply with requests. It appears to blend 'obstinate' with the '-acious' suffix pattern seen in words like 'tenacious' or 'audacious', perhaps under folk influence. The word is not standard in modern American English and would read as archaic, humorous, or dialectal to most contemporary speakers. It belongs to the tradition of expressive American folk vocabulary rather than formal usage.
The old man was the most obstinacious mule of a neighbour you'd ever meet — he refused to move his fence regardless of the survey.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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(US, regional, dated) obstinate.
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