Meaning of “assiduous” in the English Dictionary

"assiduous" in British English

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assiduousadjective

uk /əˈsɪdʒ.u.əs/ us /əˈsɪdʒ.u.əs/ formal
assiduously
adverb uk /əˈsɪdʒ.u.əs.li/ us /əˈsɪdʒ.u.əs.li/

I assiduously avoid buying imported products.
assiduousness
noun [ U ] uk /əˈsɪdʒ.u.əs.nəs/ us /əˈsɪdʒ.u.əs.nəs/

the assiduousness of his care for her
assiduity
noun [ U ] /ˌæs.ɪˈdʒuː.ə.ti/ /ˌæs.ɪˈduː.ə.t̬i/

They researched the subject with great assiduity.

(Definition of “assiduous” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)