Noun, Na-adjective (keiyodoshi), Noun which may take the genitive case particle 'no'
peace throughout the world
Yojijukugo (four character compound)
日本は一見天下泰平だが、実はいろいろな根深い問題を抱えている。Japan may appear to be peaceful and tranquil on the surface but the fact is that there are a lot of deep-rooted problems. Na-adjective (keiyodoshi), Noun which may take the genitive case particle 'no', Noun
carefree; peaceful; relaxed
Yojijukugo (four character compound)
Also written 天下太平【てんかたいへい】