belatedly
Adverb
Meaning
later than usual or than expected
Source: WordNetSynonyms
Antonyms
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the train arrived late
we awoke late
the children came late to school
notice came so tardily that we almost missed the deadline
I belatedly wished her a happy birthday
A few days after they began, a government lawyer belatedly showed up with nondisclosure forms from the Department of Homeland Security.