Adjective persistent has 3 senses
  1. persistent, relentless, unrelenting - never-ceasing; "the relentless beat of the drums"
    Antonym: sporadic (indirect, via continual)
  2. haunting, persistent - continually recurring to the mind; "haunting memories"; "the cathedral organ and the distant voices have a haunting beauty"- Claudia Cassidy
    Antonym: forgettable (indirect, via unforgettable)
  3. persistent, lasting - retained; not shed; "persistent leaves remain attached past maturity"; "the persistent gills of fishes"
    Antonyms: caducous, shed, deciduous
,
TOP