General Persistence:
* Stick to it like glue: This idiom implies unwavering dedication and refusal to let go.
* Never say die: This emphasizes a positive and determined attitude, refusing to give up.
* Tenacious as a bulldog: This evokes an image of strong determination and relentless grip.
* Unrelenting: This simply means not giving up or stopping, with a sense of relentless pressure.
Persistence with a Specific Goal:
* Go the extra mile: This emphasizes exceeding expectations and going above and beyond.
* Sweat blood: This highlights hard work and dedication towards achieving a goal.
* Doggedly pursue: This implies a focused and determined pursuit of something specific.
* Never give up the ship: This emphasizes resilience in the face of challenges, refusing to surrender.
Persistence with a Negative Connotation:
* Like a bad penny: This implies someone annoying or unwanted who keeps reappearing.
* Nagging: This refers to someone who persistently reminds or asks repeatedly.
* A thorn in one's side: This implies someone or something that causes constant annoyance or trouble.
The best idiom to use depends on the context and the specific meaning you want to convey.