To evaluate the expression \( \sqrt{19} - 32 \), we first note that \( \sqrt{19} \) is an irrational number (since 19 is not a perfect square).
Now, when we subtract 32 (which is a rational number) from an irrational number (i.e., \( \sqrt{19} \)), the result will still be an irrational number. This is because the sum or difference of a rational number and an irrational number is always irrational.
Therefore, the type of number that will result from the expression \( \sqrt{19} - 32 \) is an irrational number.
So the correct response is: an irrational number.