There are several synonyms for the phrase "minor effect" that can be used to describe a relatively small impact or influence. Some possible options include "modest effect," "limited impact," "slight influence," "inconsequential outcome," "negligible consequence," and "minimal result." These phrases can be useful when describing outcomes or actions that have only a small or minor influence on a larger situation or system. Whether discussing scientific experiments, social policy, or personal decisions, the use of appropriate synonyms can help to convey the precise degree of impact or influence being discussed.