IPA: /ˈɒb.dʒʊr.ə.si/
KK: /ˈɑb.dʒə.rə.si/
The quality of being stubborn or resistant to change, often in a way that is unyielding or inflexible.
His obduracy in refusing to compromise made the negotiations difficult.
Obduracy → It is formed from "ob-" (meaning against) and "durare" (meaning to endure or last). The word describes a state of being stubborn or resistant to change, as if enduring against persuasion or influence.
Think of being 'against' ('ob-') change and 'enduring' ('durare') stubbornly — that's what obduracy means.
No commonly confused words.