Synonyms of 'low-key'
The wedding will be a very low-key affair.
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She heard a muffled cough behind her.
Muted colours are soft and gentle, not bright and strong.
He likes sober muted colours.
Thesaurus for low-key from the Collins English Thesaurus
If you say that something is low-key , you mean that it is on a small scale rather than involving a lot of activity or being made to seem impressive or important.