The antonyms for the word "most tinsel" would be words that describe something as plain, simple, or understated. Some possible antonyms include words like plain, modest, minimal, natural, unadorned, subtle, muted, and restrained. These antonyms stand in contrast to the flashy and flamboyant nature of tinsel, which is often associated with glitz, glamour, and excess. While tinsel may be in vogue during the holiday season, it's important to remember that not everyone may subscribe to such a flashy and over-the-top aesthetic, and that there are many different ways to express our creativity and individuality.