Word of the Day : Pertinacious (opens in new tab)

per-ti-na-cious adj. :: Holding or adhering to any opinion, purpose, or design, with obstinacy; perversely persistent; obstinate adj. :: Resolute; persevering; constant; steady. "I could see that Montgomery had one of those slow, pertinacious tempers that will warm day after day to a white heat, and never again cool to forgiveness; and I saw too that this quarrel had been some time growing." -- Wells, H.G.