Which to use
“sudden” and “sullen” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #3,659
- “sudden” frequency rank
- #41,399
- “sullen” frequency rank
- 45058
- confusion score
Side-by-Side Comparison
| Feature | sudden | sullen |
|---|---|---|
| Definition | Occurring quickly with little or no warning or expectation; instantly. | Having a brooding ill temper; sulky. |
Where the spellings diverge
Shared letters are muted; the letters that actually set sudden and sullen apart are highlighted. They share 4 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
A purely visual mix-up. sudden (/ˈsʌdn̩/) and sullen (/ˈsʌlən/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 45058, derived from the frequency rank of both members and their visual similarity.
sudden is recorded at frequency rank #3,659, classified as anadj, pronounced /ˈsʌdn̩/. sullen is at rank #41,399, tagged as anadj, pronounced /ˈsʌlən/.
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 45058, this pair ranks #224,789 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of sudden vs sullen
Shared letters: ensu. Private to "sudden": d. Private to "sullen": l.
"sudden" · 6 letters · shape CVCCVC · "sullen" · 6 letters · shape CVCCVC
Known mistypes of this pair
Frequency comparison
Frequently Asked Questions
Can "sudden" and "sullen" be used interchangeably?
Which is more common, "sudden" or "sullen"?
Remembering sudden vs sullen
The fastest way to pick the right one every time.
- Read both glosses above and match the meaning you intend, only context separates this pair.
- See each word in full, definition, IPA, etymology and its other confusables. Full “sudden” entry
- Browse more pairs most likely to be confused. Most confusable