Dreaming of bitter means there is something lingering on your mind that you are not willing to let go. The thing you tasted may have been sweet previously, and the lack of it have turned the experience to bitterness. In your waking hours, focus on moving forward, let go of the boulders that you have been shouldering for too long.
If you see bitterness in your dream it means that you are feeling sorry for yourself or something that’s gone. This can be due to the loss of something such as a gift, or it could be related to someone who has died. You are sad that they are now gone and you have lost them. A dream about being bitter could also mean that you have done something bad and now feel guilty about it.