A negative Sharpe ratio indicates that the fund’s return is less than the risk-free rate, as the numerator (Fund Return - T-bill Rate) is negative. The feedback from the document states:

"The Sharpe ratio is calculated as (Fund Return - T-bill Rate) ÷ Fund Standard Deviation. A negative Sharpe ratio means the mutual fund has a return less than the risk-free rate, as the numerator of the ratio would be negative."