The term "criticize severely" can sometimes come off as harsh or confrontational. As a writer, it is important to have a variety of synonyms at your disposal to express your critiques in a more diplomatic and constructive manner. A few alternatives to consider include "reprimand," "condemn," "rebuke," "chastise," "censure," and "denounce." Additionally, you may want to use phrases such as "offer feedback," "point out flaws," or "suggest improvements." By expanding your vocabulary and understanding the nuances of different words, you can deliver feedback in a thoughtful and impactful way without causing offense or damaging relationships.