scrupulous

“Maarten is a fictional character, but his life intersects with real events—and they are scrupulously accurate,” Mason explained.

In the yard, which was kept scrupulously neat, were flowers and plants of every description which flourishes in South Louisiana.

But, I am informed there are passages in it whose "secret nature will be scrupulously observed."

Use the butter-knife, salt-spoon, and sugar-tongs as scrupulously when alone, as if a room full of people were watching you.

Every detail may be scrupulously attended to, but let the whole effect be quiet and modest.

He brought a bottle of wine from the cupboard and set it on the table, and then a glass, which he first wiped scrupulously clean.