as beautiful, pure, etc. as an angel 天使般美丽（或纯洁等）的 a seraphic child/nature 天使般可爱的孩子／纯洁的本性
extremely happy 无比快乐的 a seraphic smile 无比快乐的微笑
Word Originmid 17th cent.: from medieval Latin seraphicus, from late Latin seraphim and Greek from Hebrew śěrāp̲īm.