When you want to describe something that is not obvious or easily noticeable, you might use the word "subtle." However, there are many other words that you could use as synonyms to convey a similar meaning. For example, you could use "understated," "nuanced," or "delicate." Other options include "faint," "mild," "low-key," or "moderate." Some synonyms for "subtle" can also convey a sense of sophistication or elegance, such as "refined," "graceful," or "sophisticated." Whether you are talking about an idea, a flavor, or a color, there are many synonyms for "subtle" that can help you to evoke just the right impression and tone.