The antonyms for the phrase "did one's best" include underperformed, half-hearted, inadequate, subpar, insufficient, laziness, carelessness, negligence, and slothful. These antonyms suggest a lack of effort, motivation or commitment towards achieving a particular goal. They portray a sense of failure or falling short of expectations due to a lack of enthusiasm or interest. While doing one's best indicates that maximum effort was put into something, the antonyms emphasize the absence of this effort. These antonyms are often employed in situations where someone fails to deliver satisfactory results despite their potential, ability, or resources.
