The term 'make resentful' can be broken down into three crossword solutions: EMBITTER (8 letters), OFFEND (6 letters), and AGGRIEVE (8 letters). EMBITTER means to make someone feel bitter or angry, while OFFEND means to cause someone to feel hurt or upset. AGGRIEVE is a more intense version of OFFEND, meaning to cause someone to feel deep distress or sorrow. All three words describe the act of making someone feel resentful, which is a feeling of anger or bitterness towards someone or something.