1. Carefree and happy and lighthearted
   "a merry blithesome nature"
   - blithe, lighthearted, lightsome, light-hearted

See also: cheerful

• human ecology
• human elbow
• human face
• human foot
• human gamma globulin
• Human Genome Project
• human growth hormone
• human head
• human immunodeficiency virus
• human knee
• human language technology
• human nature
• human palaeontology
• human paleontology
• human papilloma virus
• human process
• human race
• human relationship
• human remains pouch
• human reproductive cloning
• human right
• human T-cell leukemia virus-1
• human waste
• human-centered
• human-centred