First, arrange the numbers from least to greatest. Remember that with negative numbers, larger numbers like -7 (if you ignore the minus sign) are less than smaller numbers.

-7 | -6 | -6 | -5 | -5 | -5 | -4 | -4 |

Now count how many times each number appears.

-7 appears 1 time.

-6 appears 2 times.

-5 appears 3 times.

-4 appears 2 times.

-6 appears 2 times.

-5 appears 3 times.

-4 appears 2 times.

The number that appears most often is -5.

Hence, The mode is -5.