different between sniffly vs stiffly

English

sniffle +? -y

sniffly (comparative snifflier, superlative sniffliest)

Inclined to sniffle.
I've been sniffly all weekend; I think I've caught a cold.
Resembling a sniffle.
a sniffly sound

From Middle English stifly, styfly; equivalent to stiff +? -ly.

stiffly (comparative more stiffly, superlative most stiffly)

In a stiff manner.
- 1898, J. Meade Falkner, Moonfleet Chapter 5
  'Twas Mr. Glennie who first moved to seek me; for when the second day came that I was not at school, he thought that I was ill, and went to my aunt's to ask how I did, as was his wont when any ailed. But Aunt Jane answered him stiffly that she could not say how I did.

stiffly

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