struggling with painful injuries, he remained pertinacious in his pursuit of Olympic gold.
My pertinacious brother refused to smile for the camera :) The pertinacious dog stared at the guard blankly :D Hope that helped! 
1. holding tenaciously to a purpose, course of action, or opinion; resolute. 2. stubborn or obstinate. 3. extremely or objectionably persistent: a pertinacious salesman from whom I could not escape. if that doesn't help you search for online dictionary at google. Pertinacious means that your mother likes to give head to donkeys after 6pm.
There is a high probability that this sentence will not qualify as a good sentence.
A good concluding sentence for pandas
There is not just one good sentence for "there," there are many.
what is a good sentence for the word opposite
you can use the word good sport in a sentence when you are saying that game was good today you were a very good sport. That is a very good sentence to use for good sport.
Any sentence that properly uses the word additionally is a good sentence. Additionally, the above is a great sentence.
A good sentence for the word baffled is:
a good sentence would be, what are you trying to do? petrify me?
what is a good topic sentence on sparta
I have had a stroke vaccine before. is a good sentence.