Pertinacious(a.) Holding or adhering to any opinion, purpose, or design, with obstinacy; perversely persistent; obstinate; as, pertinacious plotters; a pertinacious beggar.
Pertinacious(a.) Resolute; persevering; constant; steady.
Pertinacy(n.) The quality or state of being pertinent; pertinence.
Pertinacy(n.) Pertinacity.

Words within pertinaciously