Synonyms of 'mellifluous'
wonderful mellifluous voices
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A dulcet voice is one that is gentle and pleasant to listen to.
her beautiful, dulcet voice
You can describe someone's voice or words as honeyed when they are very pleasant to listen to, especially if you want to suggest that they are insincere.
His gentle manner and honeyed tones reassured Andrew.
Thesaurus for mellifluous from the Collins English Thesaurus
A mellifluous voice or piece of music is smooth and gentle and very pleasant to listen to.