Thankfulness is a positive attitude that implies gratitude and appreciation for the good things in life. Its opposite, un-thankfulness, causes us to focus on the negative aspects of our lives, leading to pessimism, dissatisfaction, and a lack of appreciation. Fortunately, there are plenty of antonyms for un-thankfulness that we can use to cultivate a positive mindset. Some of these antonyms include gratitude, appreciation, contentment, satisfaction, delight, joyfulness, and pleasure. By consciously choosing to focus on these positive emotions, we can reframe our perspective and generate an attitude of thankfulness that will lead to a happier and more fulfilling life.