persistent

continual, continuous, successive, constant, persistent

形容词 persistent:

1. never-ceasing
   同义词：relentless, unrelenting
2. continually recurring to the mind- Claudia Cassidy
   同义词：haunting
3. retained; not shed
   同义词：lasting

1. His persistent questions finally goaded me into an angry reply/into replying angrily.
   他三番五次地问问题惹得我回答时也没有好气。
2. She resented his persistent approaches.
   他一再地表示亲近使她很反感。
3. Cancer is a kind of persistent ailment.
   癌症是一种顽症。
4. His persistent questions finally goaded me into an angry reply.
   他三番五次地问问题惹得我回答时也没有好气。
5. Stubbornly or perversely persistent.
   顽固的顽固地或刚愎地坚持的
6. She eventually married the most persistent one of her admirers.
   她终于嫁给了最执着追求她的人。
7. Despite persistent denials, the rumor continued to spread.
   尽管一再否认，谣言还是不胫而走。

per.sist.ent

adj.（形容词）
Refusing to give up or let go; persevering obstinately.
坚持不懈的，执意的：拒绝放弃或听任的；顽固坚持的
Insistently repetitive or continuous:
持续的，存留的：不断地重复或持续的：
例句：
a persistent ringing of the telephone.
响个不停的电话铃声

Existing or remaining in the same state for an indefinitely long time; enduring:
持久的，永久的：在同一状态下持续无限长时间的；持久的：
例句：
persistent rumors; a persistent infection.
持久的谣言；持久性传染病

Botany Lasting past maturity without falling off, as the calyx on an eggplant or the scales of a pine cone.
【植物学】 宿存的，不落的：持续保持成熟后的状态而不凋落，如茄子的花萼或松果的鳞苞
Zoology Retained permanently, rather than disappearing in an early stage of development:
【动物学】 持续生存的，终身保留的：持久地保存的，而不是在生长的早期就消失的：
例句：
the persistent gills of fishes.
持续生存的鱼鳃

【引伸】
persist.ently
adv.（副词）