Definition of pertinacious:
intractable, dour, forbidding, long, pigheaded, determined, continue, grim, opinionated, persistent, perverse, lasting, coherent, unyielding, saturnine, haunting, unconquerable, fixed, firm, refractory, glum, unrelenting, decided, sour, stubborn, retentive, indomitable, bullheaded, glowering, sullen, dogged, morose, dark, moody, relentless, tenacious, headstrong, resolved, unflinching, willful, heady, stiff-necked, immovable, contumacious, bulldog, recollective, resist.
- obstinate (part of speech: adjective)
- resolute (part of speech: adjective)
- "Man and Wife", Wilkie Collins.
- "The Water-Witch or, The Skimmer of the Seas", James Fenimore Cooper.
The drawing of a will is a solemn matter to the party most concerned, and at such a time the tie of blood is apt to urge its claims in a still small voice- a mere whisper, maybe, but astonishingly pertinacious.- "The Paternoster Ruby", Charles Edmonds Walk.