One of the mysteries of the English language finally explained.
1‘the windscreen's a bit iffy, but it's a good car’
substandard, second-rate, low-grade, low-quality, of low quality, of poor quality
doubtful, dubious, questionable
not up to much
British dodgy, ropy, not much cop
2‘that date is a bit iffy’
tentative, undecided, unsettled, unsure, unreliable, unresolved, in doubt, in the balance
up in the air
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