0 the quality of showing great care and attention to detail:
the assiduousness of his care for her
He approached his job with a rare assiduousness.
It is a sign of her assiduousness that she spent ten years researching and writing the book.
Nobody should doubt the energy and assiduousness of the police searching for the murderer of one of their officers.
People are often frustrated by the bureaucratic assiduousness of state offices.
