Tight-fisted means to be stingy or unwilling to spend money. Its antonyms would be generous, lavish, open-handed, and extravagant. Generous refers to those who are willing to give and share their resources without any hesitation. Lavish applies to those who spend money in a luxurious manner and enjoy indulging themselves. Open-handed also refers to giving freely without any expectation of anything in return. Finally, extravagant implies spending money in large and excessive amounts, often beyond one's means. In conclusion, having tight-fisted tendencies means lacking generosity, whereas its antonyms suggest an abundance of resources and a willingness to share it.