Antonyms for the phrase "more bolstered" could include words such as weakened, undermined, diminished, depleted, or lessened. These words suggest a reduction in strength or support, rather than an increase. For example, if a company's profits have decreased in the last quarter, its financial position has likely been weakened. Similarly, if a person's confidence has been diminished, they may no longer feel as self-assured as they once did. Antonyms for "more bolstered" are useful for describing situations where something has experienced a decrease in support or power, rather than an increase.