So far, my friend showed no sign of interest whatsoever, but I was persistent.
Doggedly refers to in a persistent or determined manner. A sample sentence is: "Despite constant rejection, he remains doggedly attached to her".
My dad used this on me. "That kid's a persistent little cuss!"
You have to be persistent but polite is you want service from the customer service department.
He is very persistant in trying to get her to be his girlfriend.
The investigators were persistent in finding the perpetrator even though the case was labeled as "dead".
The athlete had a persistent pain in his knee. The persistent residential homeowners were finally allowed to talk with the mayor. Some pesticides remain persistent in the soil for months.
I am not writing a sentence using that word.
I can give you a sentence using the word galaxy.
a sentence using the word endotracheal
This is a sentence using the word aviator.
I am saying a sentence using the word collagen.
This is a sentence using the word monomer. :P