Lewis Short
obstĭnātĭo (noun F) : obstino
* Firmness, in a good and bad sense; resolution, steadfastness, determination, inflexibility, stubbornness, obstinacy (class.; syn.: pertinacia, contumacia): quae ego omnia obstinatione sententiae repudiavi,out of adherence to my principles,Cic. Prov. Cons. 17, 41: animi,Sen. Ep. 94, 7: fidei,Tac. H. 3, 39: taciturna,obstinate silence,Nep. Att. 22, 2: inflexibilis,Plin. Ep. 10, 97, 3.—In plur., Tert. ad Nat. 1, 17.
Charlton T. Lewis, Charles Short, A Latin Dictionary