| adjective | never-ceasing “the relentless beat of the drums” |
| adjective | continually recurring to the mind; ; - Claudia Cassidy “haunting memories” |
| adjective | retained; not shed “persistent leaves remain attached past maturity” |
| adjective | stubbornly unyielding; ; ; ; - T.S.Eliot “dogged persistence” |
| persistency | noun | persistent determination |
| persistence | noun | the property of a continuous and connected period of time |
| persist | verb | be persistent, refuse to stop |
| relentlessness | noun | mercilessness characterized by an unwillingness to relent or let up |
| lastingness | noun | permanence by virtue of the power to resist stress or force |
| doggedness | noun | persistent determination |
| pertinacity | noun | persistent determination |
| tenaciousness | noun | persistent determination |
| tenacity | noun | persistent determination |
| unyieldingness | noun | resoluteness by virtue of being unyielding and inflexible |