impropiovsimprovisoWhich spelling fits?

Quick tell: impropio is a adjective, improviso is a verb, so they fill different roles in a sentence.

Which to use

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

#33,658
“impropio” frequency rank
#43,645
“improviso” frequency rank
77303
confusion score

Side-by-Side Comparison

Feature impropio improviso
Definition Lo que está falto de las cualidades que le convendrían, según las circunstancias. Primera persona del singular (yo) del presente de indicativo de improvisar.

Where the eye mixes impropio and improviso

Muted = shared; highlighted = the visual trap. They share 7 letters in sequence.

8 ch
impropio
9 ch
improviso

Why the eye confuses impropio with improviso

These two trip readers on the page rather than in the ear: impropio is [ĩmˈpɾopjo] while improviso is [ĩmpɾoˈβ̞iso]. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (adjective vs verb), which is usually the fastest check. Our composite confusion score for this pair is 77303, derived from the frequency rank of both members and their visual similarity.

impropio is recorded at frequency rank #33,658, classified as anadj, pronounced [ĩmˈpɾopjo]. improviso is at rank #43,645, tagged as averb, pronounced [ĩmpɾoˈβ̞iso].

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 77303, this pair ranks #16,241 of 323,831 scored Spanish confusable pairs - among the most confusable pairs.

Orthographic DNA of impropio vs improviso

Shared letters: imopr. Private to "impropio": -. Private to "improviso": sv.

"impropio" · 8 letters · shape VCCCVCVV  ·  "improviso" · 9 letters · shape VCCCVCVCV

Known mistypes of this pair

  • impropioimmpropio · imporpio · imppropio · improipo · impropoi · improppio · imprpoio · imprropio
  • improvisoimmproviso · imporviso · impproviso · improbiso · improivso · improvios · improvisso · improvsio

Frequently Asked Questions

Can "impropio" and "improviso" be used interchangeably?
No - they are not even the same part of speech. "impropio" is an adjective and "improviso" a verb, so a sentence built for one is usually ungrammatical with the other.
In ordinary Spanish text, does "impropio" or "improviso" show up more?
"impropio" is the more common of the two: it sits at frequency rank #33,658 in our Spanish list, against #43,645 for "improviso". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Eye-level mix-up between "impropio" and "improviso" is sorted above. Next: full entries or other pairs that share a letter shape.

  • Full dictionary entry for "impropio" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "improviso" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #16,241 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
  • "impropio" and "improviso" also get mixed up with nearby pairs, the highest-scored neighbour is "impreciso vs improviso". 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 #16,241 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.

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

Source: FrequencyWords open word-frequency list