Many chilli recipes call for the addition of white or brown sugar to give the dish a slightly sweet taste. However, if you overdo it with the sugar in your chilli, your creation can taste too sweet. Chilli should have a spicy zip to it rather than a prominent sugary sweetness. If your chilli tastes too sweet, you don't have throw out the batch. You can remedy the problem with one or more simple fixes.
Increase the ingredients (other than sugar) in your chilli according to their proportions. For instance, if your recipe calls for one can of tomatoes, add another can. Increase all of the ingredients as well so the recipe remains balanced.
Add 1 tsp of white vinegar per quart of chilli. Stir and taste the chilli to see if the sweetness has faded. Gradually add more vinegar, if necessary.
Add 1/2 tsp dry mustard per quart of chilli. Stir it in and taste the chilli to see if you need to add more gradually.
Pour 1 tsp of lemon juice per quart of chilli. Stir and sample to see if the sweetness is gone. Add more if necessary.