understatedly

/ˌʌndərˈsteɪtɪdli/
adverb
  1. In a simple, subtle, or restrained manner; without showiness or exaggeration.
    • The room was understatedly decorated with just a few pieces of art.
    • He understatedly mentioned his award, as if it were no big deal.
    • The film's ending is understatedly powerful, leaving a lasting impression.