from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. In a stubbornly resolute manner; tenaciously holding one's opinion or course of action.
from The Century Dictionary and Cyclopedia
- In a pertinacious manner; obstinately; firmly; with pertinacity; resolutely.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adv. in a dogged and pertinacious manner
From pertinacious + -ly, from Latin pertināx, from per- ("very") + tenāx ("tenacious"), from teneō ("I hold"). (Wiktionary)