The quality or state of being pertinacious: "Again and again ... with the inexorable pertinacity of a child ... did he renew his efforts” ( Nathaniel Hawthorne).
The state or feature to be pertinacious.
the high quality or condition to be pertinacious; obstinacy; perseverance; persistency.
the type of being pertinacious; resoulute or unyieding adherence, regarding an opinion, function, design, course of action, etc.; persistency; obstinacy; resoluteness: because, to cling with pertinacity to at least one's function.