"dogged persistence"
"dour determination"
"the most vocal and pertinacious of all the critics"
"a mind not gifted to discover truth but tenacious to hold it"
"men tenacious of opinion"
My wife in a dogged humour for my not dining at home.
出自: S. Pepys
He had not spoken angrily but in a curiously dogged tone, with awkward emphasis.
出自: G. Gissing