Synonyms of the word

persistent

• adj. Obstinately refusing to give up or let go.
• adj. Insistently repetitive.
• adj. Indefinitely continuous.
• adj. (botany) Lasting past maturity without falling off.
• adj. (computing) Of data or data structures: existing after the execution of the program. Remaining in existence…
• adj. (mathematics) Describing a fractal process that has a positive Brown function.
• adj. (mathematics, stochastic processes, of a state) non-transient.

continual

• adj. Recurring in steady, rapid succession.
• adj. (proscribed) Seemingly continuous; appearing to have no end or interruption.
• adj. (proscribed) Forming a continuous series.

haunting

• v. present participle of haunt.
• adj. Remaining in the mind; not easily forgotten.
• n. A particular instance of haunting; a ghostly habitation.

lasting

• adj. Persisting for an extended period of time.
• v. present participle of last.
• n. continuance; endurance.
• n. A durable woollen material formerly used for women's shoes; everlasting.
• n. The act or process of shaping on a last.

relentless

• adj. Unrelenting or unyielding in severity.
• adj. Unremitting, steady and persistent.

unforgettable

• adj. Very difficult or impossible to forget.

unrelenting

• adj. Not relenting; having no pity; not being or becoming lenient, mild, gentle, or merciful; unyielding; inflexibly…