The phrase "dost utmost" is an old-fashioned way of saying that someone is exerting their maximum effort or doing everything in their power to accomplish something. Antonyms for "dost utmost" could include words that describe a lack of effort, such as lazy, apathetic, or indifferent. Other antonyms could describe someone who is actively working against the goal at hand, such as obstructive, uncooperative, or sabotaging. Alternatively, antonyms could describe someone who is not putting in their full effort, such as half-hearted, lackadaisical, or lukewarm. Overall, there are many different ways to describe the opposite of "dost utmost," depending on the context and the motivations of the person involved.