STUBBORN Copy link • STUBBORNpertinax: pervicax: obstinatus: offirmatus: contumax [SYN. in OBSTINATE]: praefractus (not yielding): perversus (perverse, not so as it should be): difficilis: natura difficilis (obstinate, difficult to manage or to treat). (The words are found in this connection and order.) difficilis et morosus: ☞ refractarius and praefractus are entirely foreign to standard prose.