adjective, iffier, iffiest. Informal.
full of unresolved points or questions: an iffy situation.
doubtful; questionable: An early decision on this is iffy.

1915–20; if + -y1

iffiness, noun

1. doubtful, unsettled, uncertain, speculative.
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World English Dictionary
iffy (ˈɪfɪ)
adj , iffier, iffiest
informal uncertain or subject to contingency: this scheme sounds a bit iffy
[C20: from if + -y1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Slang Dictionary

iffy definition

  1. mod.
    marginally uncertain. : Things are still sort of iffy, but we'll know for sure in a few days.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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