Obstinate Sort is a term used to describe someone who is determined and unyielding in their beliefs or actions. The crossword solutions for this term are Defier (6 letters), ASS (3 letters), and Toughcookie (11 letters). Defier implies someone who stands up against authority, ASS suggests stubbornness, and Toughcookie implies a person who is resilient and not easily swayed. Together, these words paint a picture of someone who is strong-willed and unyielding.