Meaning of “muted” - Learner’s Dictionary

muted

adjective uk us /ˈmjuːtɪd/
FEELING

not strongly expressed:

muted criticism
SOUND

A muted sound is quieter than usual:

muted voices
COLOUR [ always before noun ]

A muted colour is not bright or easily noticed:

He was dressed in muted shades of grey and brown.

(Definition of “muted” from the Cambridge Learner’s Dictionary © Cambridge University Press)