dudavsdudosaWhich spelling fits?

Quick tell: duda is a noun, dudosa is an adjective, so they fill different roles in a sentence.

Which to use

“duda” is a noun and “dudosa” is an adjective - they look or sound alike but fill different roles in a sentence.

#656
“duda” frequency rank
#15,075
“dudosa” frequency rank
15731
confusion score

Side-by-Side Comparison

Feature duda dudosa
Definition Acción o efecto de dudar. Dificultad para elegir entre dos o más opciones, o suspensión de tal decisión. Forma del femenino de dudoso.

Where the eye mixes duda and dudosa

Muted = shared; highlighted = the visual trap. They share 4 letters in sequence.

4 ch
duda
6 ch
dudosa

Visual trap between duda and dudosa

These two trip readers on the page rather than in the ear: duda is [ˈd̪uð̞a] while dudosa is [d̪uˈð̞osa]. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 letter(s) in length, and the parts of speech differ too (noun vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 15731, derived from the frequency rank of both members and their visual similarity.

duda is recorded at frequency rank #656, classified as anoun, pronounced [ˈd̪uð̞a]. dudosa is at rank #15,075, tagged as anadj, pronounced [d̪uˈð̞osa].

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 15731, this pair ranks #279,001 of 323,831 scored Spanish confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of duda vs dudosa

Shared letters: adu. Private to "duda": -. Private to "dudosa": os.

"duda" · 4 letters · shape CVCV  ·  "dudosa" · 6 letters · shape CVCVCV

Known mistypes of this pair

  • dudaddua · dduda · duad · dudda · udda
  • dudosaddudosa · dduosa · duddosa · dudoas · dudossa · dudsoa · duodsa · uddosa

Frequently Asked Questions

Do "duda" and "dudosa" mean the same thing in a sentence?
No - they are not even the same part of speech. "duda" is a noun and "dudosa" an adjective, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "duda" or "dudosa"?
"duda" is the more common of the two: it sits at frequency rank #656 in our Spanish list, against #15,075 for "dudosa". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.

  • Full dictionary entry for "duda" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "dudosa" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #279,001 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
  • "duda" and "dudosa" also get mixed up with nearby pairs, the highest-scored neighbour is "dudosa vs dudosas". 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 #279,001 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