low-key

/L OW1 K IY0/
adjective
  1. 1

    Dark; characterised by dark tones and muted colours.

  2. 2

    Restrained, subtle, not trying to attract attention.

    โ€œShe deserves an Oscar for her low-key performance in that movie.โ€

Antonyms

adverb
  1. 1

    A little; somewhat.

  2. 2

    In a low-key or surreptitious manner; secretively; on the down-low

Synonyms

Source: https://en.wiktionary.org/wiki/low-key