Adjective
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stubbornly unyielding
"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"- T.S.Eliot
"men tenacious of opinion"
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retained
not shed
"persistent leaves remain attached past maturity"
"the persistent gills of fishes"
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continually recurring to the mind
"haunting memories"
"the cathedral organ and the distant voices have a haunting beauty"- Claudia Cassidy
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never-ceasing
"the relentless beat of the drums"