Synonyms for mellow

adjective

• slightly and pleasantly intoxicated from alcohol or a drug (especially marijuana)
• softened through age or experience
• having a full and pleasing flavor through proper aging
• unhurried and relaxed

verb

• become more relaxed, easygoing, or genial
• make or grow (more) mellow
• soften, make mellow

adverb

• in a mellow manner