Definify.com
Webster 1913 Edition
Pertinacious
1.
Holding or adhering to any opinion, purpose, or design, with obstinacy; perversely persistent; obstinate;
as,
pertinacious
plotters; a pertinacious
beggar.2.
Resolute; persevering; constant; steady.
Diligence is a steady, constant, and
pertinacious
study. South.
Syn. – Obstinate; stubborn; inflexible; unyielding; resolute; determined; firm; constant; steady.
– Perˊti-na′cious-ly
, adv.
Perˊti-na′cious-ness
, Noun.
Webster 1828 Edition
Pertinacious
PERTINA'CIOUS
,Adj.
1.
Holding or adhering to any opinion, purpose or design with obstinacy; obstinate; perversely resolute or persistent; as pertinacious in opinion; a man of pertinacious confidence.2.
Resolute; firm; constant; steady. Diligence is a steady, constant, pertinacious study--
[This word often implies a censurable degree of firmness of constancy, like obstinacy.