More resentful is a term used to describe someone who is feeling more intense anger or bitterness than before. Bitterer (8 letters) and SORER (5 letters) are two words that can be used to describe this feeling. Bitterer means having a stronger feeling of bitterness, while SORER means having a stronger feeling of pain or distress. Together, these two words can be used to describe someone who is feeling more resentful than before.