The antonyms for the phrase "most tight-fisted" are numerous. They can range from "generous" to "lavish," "open-hearted" to "free-spending." Other possible antonyms include "magnanimous," "abundant," "indulgent," "liberal," "unselfish," and "benevolent." All of these adjectives convey a sense of openness and willingness to share, compared to the stingy and miserly characteristics that tight-fistedness represents. By moving away from being tight-fisted and embracing any of these opposing traits, you will be able to live a happier, more contented life, and develop more meaningful relationships with those around you.