i Register
In some senses, iffy is marked as slang. Watch for register when choosing this word.
adj
Of dubious authenticity, legitimacy or legality.
He's selling new CD players for £20 each – that sounds a bit iffy to me.
Uncertain or chancy; risky.
The weather is still iffy for Saturday's rocket launch.
That potato salad smells a bit iffy. Don't chance it — it's not worth salmonellosis.