persistent
adj 1: never-ceasing; "the relentless beat of the drums" [syn: {relentless},
{unrelenting}]
2: continually recurring to the mind; "haunting memories"; "the
cathedral organ and the distant voices have a haunting
beauty"- Claudia Cassidy [syn: {haunting}]
3: (biology) retained; not shed; "persistent leaves remain
attached past maturity"; "the persistent gills of fishes"
[syn: {lasting}] [ant: {caducous}]