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Adjective: dulcet  dúl-sit
  1. Pleasing to the ear
    "the dulcet tones of the cello";
    - honeyed, mellifluous, mellisonant, sweet, mellifluent
     
  2. Extremely pleasant in a gentle way
    "the most dulcet swimming on the most beautiful and remote beaches"

See also: melodic, melodious, musical, pleasant