Which to use
“unstable” and “usable” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #8,741
- “unstable” frequency rank
- #14,447
- “usable” frequency rank
- 23188
- confusion score
Side-by-Side Comparison
| Feature | unstable | usable |
|---|---|---|
| Definition | Not stable. | Capable of being used. |
Where the eye mixes unstable and usable
Muted = shared; highlighted = the visual trap. They share 6 letters in sequence.
Visual trap between unstable and usable
A purely visual mix-up. unstable (/ʌnˈsteɪ.bəl/) and usable (/ˈjuː.zə.bəl/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 2 letter(s) in length. Our composite confusion score for this pair is 23188, derived from the frequency rank of both members and their visual similarity.
unstable is recorded at frequency rank #8,741, classified as anadj, pronounced /ʌnˈsteɪ.bəl/. usable is at rank #14,447, tagged as anadj, pronounced /ˈjuː.zə.bəl/.
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 23188, this pair ranks #411,124 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of unstable vs usable
Shared letters: abelsu. Private to "unstable": nt. Private to "usable": -.
"unstable" · 8 letters · shape VCCCVCCV · "usable" · 6 letters · shape VCVCCV
Known mistypes of this pair
Frequently Asked Questions
Can "unstable" and "usable" be used interchangeably?
Which is more common, "unstable" or "usable"?
What to do next
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "unstable" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "usable" - compare definitions side by side with the headword page. Word entry
- This pair ranks #411,124 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "unstable" and "usable" also get mixed up with nearby pairs, the highest-scored neighbour is "unusable vs usable". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #411,124 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.