assiduous
adjective
as·sid·u·ous
ə-ˈsij-wəs
-ˈsi-jə-
: showing great care, attention, and effort : marked by careful unremitting attention or persistent application
assiduous planning
an assiduous book collector
She tended her garden with assiduous attention.
assiduously
adverb
assiduousness
noun
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Merriam-Webster unabridged
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