adjective UK and US /əˈsɪd.ju.əs/ (click link to hear the word spoken in British or American English)
› showing hard work, care, and attention to detail:
an assiduous student
The government has been assiduous in the fight against inflation.
assiduously /-li/ adverb›I assiduously avoid buying imported products.
assiduousness /-nəs/ noun