blithe

Adjective

• carefree and happy and lighthearted
  • was loved for her blithe spirit
    
  • a merry blithesome nature
    
  • her lighthearted nature
    
  • trilling songs with a lightsome heart
    

• lacking or showing a lack of due concern
  • spoke with blithe ignorance of the true situation
    

Related words

• Synonyms: 
  blithesome , lighthearted , lightsome , light-hearted