Pure cussedness is a phrase that refers to someone's stubbornness, obstinacy, and sometimes malicious behavior. There are many synonyms that can be used instead of "pure cussedness." One common synonym is "pigheadedness," which implies that someone is refusing to listen or to consider different viewpoints. Another similar synonym is "mulishness," which also suggests a stubborn and obstinate attitude. "Obstinacy" and "intractability" describe someone who is difficult to manage or persuade. "Belligerence" and "pugnacity" are synonyms that indicate a more aggressive or combative attitude. Other words related to "pure cussedness" include "defiance," "recalcitrance," and "contrariness.