As an adjective iffy
is (slang) of dubious authenticity, legitimacy or legality.
As an adverb iffily is
(informal) in an iffy manner.
Other Comparisons: What's the difference?
(slang) Of dubious authenticity, legitimacy or legality.
Uncertain or chancy.
- He's selling new CD players for £20 each – that sounds a bit iffy to me.
- The weather is still iffy for Saturday's shuttle launch.
* (of dubious authenticity) dodgy, dubious, fishy
* See also
(informal) In an iffy manner.