adverb (r)

• with relatively high volume(adv.all)

  Example:
  The band played loudly.
  She spoke loudly and angrily.
  

  Synonym:
  aloud, loud
  Antonym:
  quietly, softly
  

  source: wordnet30
• in manner that attracts attention(adv.all)

  Synonym:
  clamorously, obstreperously
  

  source: wordnet30
• used as a direction in music; to be played relatively loudly(adv.all)

  Synonym:
  forte
  Antonym:
  piano, softly
  

  source: wordnet30
• In a loud manner.(adverb)

  source: webster1913