Etymology
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flatly (adv.)

early 15c. in a literal sense, from flat (adj.) + -ly (2). Meaning "in a plain manner" is from 1560s; sense of "in a dull manner" is from 1640s.

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Definitions of flatly

flatly (adv.)
in an unqualified manner;
he flatly denied the charges
Synonyms: categorically / unconditionally
From wordnet.princeton.edu