adjective Etymology: Latin assiduus, from assidēre Date: 1622 marked by careful unremitting attention or persistent application , see: busy ~ly adverb ~ness noun
ASSIDUOUS
Meaning of ASSIDUOUS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012