Mellowest meaning : To make mellow; to relax or soften. To become mellow. Soft or tender by reason of ripeness; having a tender pulp. Easily worked or penetrated; not hard or rigid. Not coarse, rough, or harsh; subdued, soft, rich, delicate; said of sound, color, flavor, style, etc. Well matured; softened by years; genial; jovial. Relaxed; calm; easygoing; laid-back. Warmed by liquor, slightly intoxicated, stoned, or high.