English to English

adjective (a)

• oblivious of dangers or perils or calmly resolute in facing them(adj.all)

  Synonym:
  fearless
  Antonym:
  afraid
  

  source: wordnet30
• free from fear or doubt; easy in mind(adj.all)

  Synonym:
  secure, untroubled
  Antonym:
  insecure
  

  source: wordnet30