The phrase "have qualms" means to have doubts or reservations about a particular action or decision. There are many synonyms for this phrase, including hesitancy, uncertainty, indecision, unease, apprehension, misgivings, and skepticism. These words all convey a sense of caution and hesitation when it comes to making a decision or taking action. Other synonyms for "have qualms" include second-guessing, doubting, questioning, and wavering. These words all indicate a lack of confidence or uncertainty about a particular situation. Regardless of which synonym is used, the underlying meaning remains the same - a sense of hesitation or doubt about a particular course of action.