What does iffy mean?
Iffy is an informal adjective meaning doubtful, questionable, or not entirely trustworthy. It is used when something seems suspicious or lacks a quality needed for confidence, as in “an iffy explanation” or “an iffy recommendation.” The word often communicates hesitation without insisting that a serious problem definitely exists. It can also describe something likely to fail or cause trouble, such as an unreliable plan or a rough journey. In a more physical sense, iffy means slightly ill or nauseated. Iffy is common in everyday speech in both British and American English, though it remains more casual than formal terms such as doubtful, dubious, and questionable. Its usefulness lies in its flexibility: it can range from a mild expression of unease to a stronger warning that something is unsafe, unreliable, or likely to go wrong.
adjectiveInformal, chiefly: involving doubt, uncertainty, or a risk of being unreliable; questionable or suspect.
- Doubtful or uncertain; questionable.
- Likely to fail, cause trouble, or be unreliable.
- Physically queasy, or causing a feeling of nausea.
"We had an iffy feeling about taking the shortcut after dark."
"The plan sounded promising, but there were several details that seemed iffy."
"After eating the seafood, she felt iffy and spent the rest of the afternoon resting."
Iffy captures the useful distinction between something that is definitely wrong and something that simply cannot be trusted.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does iffy come from?
Iffy is a relatively modern informal English word, and its precise origin is uncertain. It is generally treated as an informal coinage rather than a regular development from an earlier English word, so no secure family of historical cognates is recognized. Its standardized spelling and established use in British and American English followed the word’s growth as a general term for doubt and uncertainty.
How iffy is actually used
Informal and often mildly humorous. In its first two senses, it conveys suspicion or lack of confidence rather than definite proof that something is bad.