Ursine means having similarities to bears. Telling a woman that she has "ursine qualities" will not get you a second date. In fact, saying that a woman resembles a bear will probably get you slapped.
Ursine means to have bear-like qualities: big, furry, muscular, and lumbering. If you're using the word to describe a big, hulking football player it might be perceived as a compliment. If, on the other hand, you use ursine to describe a woman, she wouldn't be flattered at all. Ursine originated back in the 16th century, from the Latin word for — you guessed it — "bear."