Meanings
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1
adv
with care and persistence
We worked assiduously on our senior theses.
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2
adv
In an assiduous manner; diligently, industriously.
He who had appeared rather assiduously to shun her, whose good opinion she had valued, notwithstanding his seeming indifference to her, had now declared himself, and given proofs of a regard the most unequivocal.
Etymology
From assiduous + -ly.