Which to use
“staid” is an adjective and “STI” is a noun - they look or sound alike but fill different roles in a sentence.
- #48,507
- “staid” frequency rank
- #26,266
- “STI” frequency rank
- 74773
- confusion score
Side-by-Side Comparison
| Feature | staid | STI |
|---|---|---|
| Definition | Not capricious or impulsive; sedate, serious, sober. | Initialism of sexually transmitted infection (also S.T.I.). |
Letter map: staid vs STI
Shared letters muted; letters that set staid and STI apart highlighted. Shared run: 3.
Part-of-speech tell for staid / STI
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: staid is anadjective and STIanoun. On the page they differ by 2 letter(s) in length. Our composite confusion score for this pair is 74773, derived from the frequency rank of both members and their visual similarity.
staid is recorded at frequency rank #48,507, classified as anadj, pronounced /steɪd/. STI is at rank #26,266, tagged as anoun.
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 74773, this pair ranks #35,256 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of staid vs STI
Shared letters: ist. Private to "staid": ad. Private to "STI": -.
"staid" · 5 letters · shape CCVVC · "STI" · 3 letters · shape CCV
Known mistypes of this pair
- staid ← satid · sstaid · stadi · staidd · stiad · sttaid · tsaid
Frequently Asked Questions
Is swapping "staid" for "STI" ever safe?
Which is more common, "staid" or "STI"?
After this comparison
Pair "staid" vs "STI" is on the table, pick a follow-up below.
- Full dictionary entry for "staid" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "STI" - compare definitions side by side with the headword page. Word entry
- This pair ranks #35,256 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "staid" and "STI" also get mixed up with nearby pairs, the highest-scored neighbour is "Sajid vs staid". 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 #35,256 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.