fading

(noun) weakening in force or intensity. Synonyms: attenuation. Examples: "Attenuation in the volume of the sound."

(verb) become less clearly visible or distinguishable; disappear gradually or seemingly. Synonyms: fade, melt. Examples: "The scene begins to fade." "The tree trunks are melting into the forest at dusk."

(verb) lose freshness, vigor, or vitality. Synonyms: fade, wither. Examples: "Her bloom was fading."

(verb) disappear gradually. Synonyms: evanesce, fade, blow over, pass off, fleet, pass. Examples: "The pain eventually passed off."

(verb) become feeble. Synonyms: languish, fade. Examples: "The prisoner has be languishing for years in the dungeon."