"Play light" is a common expression used to describe a playful, lighthearted attitude. There are many synonyms that can be used to convey similar meanings. Some of these include "carefree," "jovial," "buoyant," "careless," "frolicsome," "blithe," "uninhibited," "cheerful," and "merry." Each of these words conveys a sense of fun and playfulness, and can be used to describe someone who is enjoying life and not taking things too seriously. Whether used in casual conversation, writing, or more formal situations, these synonyms provide a range of options for expressing a lighthearted, playful tone.