The term 'Animal Stubborn' can be summarized by two crossword solutions: 'ORNERY' (6 letters) and 'MULES' (5 letters). ORNERY is an adjective used to describe someone or something that is bad-tempered, irritable, and uncooperative. MULES are a hybrid animal, created by breeding a male donkey with a female horse. They are known for their strength and stubbornness. Both of these words are used to describe animals that are difficult to manage due to their strong-willed nature.