Which to use
“idly” is an adverb and “iffy” is an adjective - they look or sound alike but fill different roles in a sentence.
- #31,612
- “idly” frequency rank
- #37,981
- “iffy” frequency rank
- 69593
- confusion score
Side-by-Side Comparison
| Feature | idly | iffy |
|---|---|---|
| Definition | Without specific purpose, intent or effort. | Of dubious authenticity, legitimacy or legality. |
Where the spellings diverge
Shared letters are muted; the letters that actually set idly and iffy apart are highlighted. They share 2 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
These two trip readers on the page rather than in the ear: idly is /ˈaɪd(ə)lɪ/ while iffy is /ˈɪfi/. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (adverb vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 69593, derived from the frequency rank of both members and their visual similarity.
idly is recorded at frequency rank #31,612, classified as anadv, pronounced /ˈaɪd(ə)lɪ/. iffy is at rank #37,981, tagged as anadj, pronounced /ˈɪfi/.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 69593, this pair ranks #53,911 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of idly vs iffy
Shared letters: iy. Private to "idly": dl. Private to "iffy": f.
"idly" · 4 letters · shape VCCV · "iffy" · 4 letters · shape VCCV
Known mistypes of this pair
Frequency comparison
Frequently Asked Questions
Can "idly" and "iffy" be used interchangeably?
Which is more common, "idly" or "iffy"?
Remembering idly vs iffy
The fastest way to pick the right one every time.
- Check the role first: if you need an adverb, it's “idly”; for an adjective, it's “iffy”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “idly” entry
- Browse more pairs most likely to be confused. Most confusable