adjective, uncertain, doubtful (COD)
“Airboats, when the ice was iffy, you could pull yourself across.”
“Quite a number of them come to the Island here after the war and, you know, ‘Well you’re just having a baby. That’s nothing’. So they’d bring them down and put them on the ferry. And when we’d get to Kingston, we had to get them to Hotel Dieu [Hosptial] or Kingston General [Hospital]. And once in a while it was a little iffy.”