obdurate
C2CEFR level
78/100Rarity: rare
FormalRegister
General adjective
Stubbornly refusing to change one's mind.
He remained obdurate despite every appeal.
Law adjective
Stubbornly refusing to alter a stance or be persuaded.
Faced with an obdurate respondent, the mediator adjourned to let tempers cool.
Business adjective
Stubbornly refusing to change one's mind or course of action.
He proved obdurate on the exclusivity clause, and no counterargument moved him.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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