Antonyms for the phrase "giving one's all" can be found in terms of half-hearted effort, minimal investment, or lack of commitment. Some phrases that can be seen as contrary to giving one's all include holding back, not putting in effort, showing disinterest, or not putting in maximum effort. Other antonyms for this phrase may include taking it easy, being lax, or showing partial effort. When an individual doesn't give their all, they may not be fully engaged, enthusiastic, or committed to their task, leading to less than desirable outcomes. Therefore, it is important to strive to give one's all in every aspect of life.