gradually

indicates a slow, steady process of alteration or transformation.

indicates a slow, steady rise in amount, number, or intensity.

indicates a slow, steady reduction in amount, number, or intensity.

indicates a slow, steady increase in size, scope, or volume.

indicates a slow process of ceasing to be visible or to exist.

indicates a slow, steady process of development and change.

indicates a slow, steady loss of color, brightness, or strength.

indicates a slow process of coming into view or becoming known.

indicates a slow gathering or build-up of something over time.

indicates a slow, steady decline in power, strength, or effectiveness.