#1 persistent s. [relentless, unrelenting] never-ceasing; "the relentless beat of the drums". wn
#2 persistent s. [haunting] continually recurring to the mind; "haunting memories"; "the cathedral organ and the distant voices have a haunting beauty"- Claudia Cassidy. wn
#3 persistent s. [dogged, dour, 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". wn
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