Considering obstinacy noun obstinately adverb the stem should be Obstin. But actually it has a Latin origin L. obstinatus , obstinare .
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AnonymousWhat is the stem for the word: obstinatestin, from an Indo-European suffixed form ste-no, from sta, having to do with standing or stability. ob is a Latinate prefix with various meanings, including 'away from'. ate is an adjectival ending.