Accruement is a noun that refers to the process of accumulating or gradually building up something over time. Some antonyms for this word include diminishing, reducing, decreasing, and depleting. Diminishing implies a gradual decrease or lessening over time, while reducing indicates a deliberate action to lessen or minimize something. Decreasing refers to a steady or abrupt decline in quantity, while depleting implies a rapid or excessive reduction. Other antonyms for accrual might include spending, dissipating, squandering, and wasting. These words are useful in describing the opposite process of accumulating or building up resources, assets, or other forms of value.