If you describe something as immaculate, you mean that it is extremely clean, tidy, or neat.
pristine
Her kitchen was kept immaculate.
她的厨房保持得一尘不染。
If you say that something is immaculate, you are emphasizing that it is perfect, without any mistakes or bad parts at all.
The goalie's performance was immaculate.
守门员的表现完美无缺。