decidivsdécimoTell them apart

Quick tell: decidi is a verb, décimo is an adjective, so they fill different roles in a sentence.

Which to use

“decidi” is a verb and “décimo” is an adjective - they look or sound alike but fill different roles in a sentence.

#3,675
“decidi” frequency rank
#9,044
“décimo” frequency rank
12719
confusion score

Side-by-Side Comparison

Feature decidi décimo
Definition primeira pessoa do singular do pretérito perfeito do indicativo do verbo decidir refere-se àquele que ocupa a posição dez em uma série; o que vem depois do nono

Where the eye mixes decidi and décimo

Muted = shared; highlighted = the visual trap. They share 3 letters in sequence.

6 ch
decidi
6 ch
décimo

Look-alike desk: decidi vs décimo

These two trip readers on the page rather than in the ear: decidi is /de.sɪˈʤi/ while décimo is /ˈdɛ.si.mu/. 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 12719, derived from the frequency rank of both members and their visual similarity.

decidi is recorded at frequency rank #3,675, classified as averb, pronounced /de.sɪˈʤi/. décimo is at rank #9,044, tagged as anadj, pronounced /ˈdɛ.si.mu/.

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 12719, this pair ranks #59,790 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of decidi vs décimo

Shared letters: cdi. Private to "decidi": e. Private to "décimo": moé.

"decidi" · 6 letters · shape CVCVCV  ·  "décimo" · 6 letters · shape CVCVCV

Known mistypes of this pair

  • decididceidi · ddecidi · deccidi · decdii · deciddi · deciid · deicdi · edcidi

Frequently Asked Questions

Can "decidi" and "décimo" be used interchangeably?
No - they are not even the same part of speech. "decidi" is a verb and "décimo" an adjective, so a sentence built for one is usually ungrammatical with the other.
In ordinary Portuguese text, does "decidi" or "décimo" show up more?
"decidi" is the more common of the two: it sits at frequency rank #3,675 in our Portuguese list, against #9,044 for "décimo". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.

  • Full dictionary entry for "decidi" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "décimo" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #59,790 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
  • "decidi" and "décimo" also get mixed up with nearby pairs, the highest-scored neighbour is "decade vs decidi". 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 #59,790 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list