verb
persist
per-SIST/pərˈsɪst/
Continue over time despite difficulty or opposition.
The tired hiker persists up the difficult rocky trail.

Etymology
The pieces give an image of standing thoroughly firm. Latin persistere already meant continuing steadfastly, connecting that firmness with keeping to a course despite opposition.
In context
the condition is particularly resilient to treatment and can persist to up to 2 years
More examples
- He persisted in asking questions even after they dismissed his concerns.
- The pain persists despite medication.
- These weeds persist even after repeated attempts to remove them.
Forms
persist · persists · persisted · persisting
persistence noun — Continued effort or existence despite difficulty.
persistent adjective — Continuing despite difficulty, opposition, or attempted removal.