Which to use
“arder” is a verb and “árduo” is an adjective - they look or sound alike but fill different roles in a sentence.
- #20,500
- “arder” frequency rank
- #22,504
- “árduo” frequency rank
- 43004
- confusion score
Side-by-Side Comparison
| Feature | arder | árduo |
|---|---|---|
| Definition | inflamar-se, estar em chamas | de difícil acesso |
Where the eye mixes arder and árduo
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence. arder (VCCVC) and árduo (VCCVV) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Why the eye confuses arder with árduo
These two trip readers on the page rather than in the ear: arder is /ɐɾ.ˈdeɾ/ while árduo is /ˈaɾ.dwu/. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 3 positions, and the parts of speech differ too (verb vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 43004, derived from the frequency rank of both members and their visual similarity.
arder is recorded at frequency rank #20,500, classified as averb, pronounced /ɐɾ.ˈdeɾ/. árduo is at rank #22,504, tagged as anadj, pronounced /ˈaɾ.dwu/.
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 43004, this pair ranks #22,684 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of arder vs árduo
Shared letters: dr. Private to "arder": ae. Private to "árduo": ouá.
"arder" · 5 letters · shape VCCVC · "árduo" · 5 letters · shape VCCVV
Known mistypes of this pair
- arder ← adrer · ardder · arderr · ardre · aredr · arrder · rader
Frequently Asked Questions
Is swapping "arder" for "árduo" ever safe?
Which is more common, "arder" or "árduo"?
Useful next steps
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "arder" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "árduo" - compare definitions side by side with the headword page. Word entry
- This pair ranks #22,684 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
- "arder" and "árduo" also get mixed up with nearby pairs, the highest-scored neighbour is "arar vs arder". 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 #22,684 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.