different between oddly vs seriously

English

From Middle English odly, oddely, equivalent to odd +? -ly.

oddly (not comparable)

In a peculiar manner; strangely; unusually.
For December, it was oddly warm.
Synonyms: queerly, curiously
In a manner measured by an odd number.
- 1998, Kay Almere Read, Time and Sacrifice in the Aztec Cosmos (page 107)
  The oddly counted lords are always out of sync with at least one other evenly counted cycle. These two strange counts assured that at no single moment could all cycles end at the same time for an extraordinarily long time, for at least one odd count threw off all the even ones.

serious +? -ly

seriously (comparative more seriously, superlative most seriously)

(manner) In a serious or literal manner.
Gravely; deeply; very much.
Used to attempt to introduce a serious point in a less serious conversation.
Synonyms: no really, no kidding
Used to call back to a previous point, in disbelief or for emphasis.
Synonyms: no really, no kidding

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