Tenacious

a.
  1. Holding fast, or inclined to hold fast; inclined to retain what is in possession; as, men tenacious of their just rights.
  2. Apt to retain; retentive; as, a tenacious memory.
  3. Having parts apt to adhere to each other; cohesive; tough; as, steel is a tenacious metal; tar is more tenacious than oil.
  4. Apt to adhere to another substance; glutinous; viscous; sticking; adhesive.
  5. Niggardly; closefisted; miserly.
  6. Holding stoutly to one's opinion or purpose; obstinate; stubborn.