The substantial rise in short interest for Unum Group suggests that investors are becoming more bearish on the stock. This could lead to increased selling pressure in the short term. However, the fact that it has a higher short interest than its peers might also indicate that it's being targeted more by short sellers, which doesn't always correlate directly with fundamental weaknesses in the company. Therefore, while the increase in short interest is a bearish signal, it's not an infallible predictor of a forthcoming price decline.