"persistent" in the adjective sense
1. persistent, relentless, unrelenting
never-ceasing
"the relentless beat of the drums"
2. haunting, persistent
continually recurring to the mind
"haunting memories"
"the cathedral organ and the distant voices have a haunting beauty"- Claudia Cassidy
3. persistent, lasting
retained not shed
"persistent leaves remain attached past maturity"
"the persistent gills of fishes"
4. dogged, dour, persistent, pertinacious, tenacious, unyielding
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"
Source: WordNet® (An amazing lexical database of English)
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