fehlerhaftevsfehlerhaftenTell them apart

Which to use

“fehlerhafte” and “fehlerhaften” are a confusable German pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#21,596
“fehlerhafte” frequency rank
#30,553
“fehlerhaften” frequency rank
52149
confusion score

Side-by-Side Comparison

Feature fehlerhafte fehlerhaften
Definition Nominativ Singular Femininum der starken Deklination des Positivs des Adjektivs fehlerhaft Genitiv Singular Maskulinum der starken Deklination des Positivs des Adjektivs fehlerhaft

Where the eye mixes fehlerhafte and fehlerhaften

Muted = shared; highlighted = the visual trap. They share 11 letters in sequence. fehlerhafte runs 11 letters (CVCCVCCVCCV) against fehlerhaften's 12 (CVCCVCCVCCVC) - the length gap alone is often enough to separate them once you know to check it.

11 ch
fehlerhafte
12 ch
fehlerhaften

Why the eye confuses fehlerhafte with fehlerhaften

A purely visual mix-up. fehlerhafte ([ˈfeːlɐhaftə]) and fehlerhaften ([ˈfeːlɐhaftn̩]) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 extra letter(s) - “fehlerhafte” sits inside “fehlerhaften”. Our composite confusion score for this pair is 52149, derived from the frequency rank of both members and their visual similarity.

fehlerhafte is recorded at frequency rank #21,596, classified as anadj, pronounced [ˈfeːlɐhaftə]. fehlerhaften is at rank #30,553, tagged as anadj, pronounced [ˈfeːlɐhaftn̩].

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 52149, this pair ranks #1,108,172 of 2,006,359 scored German confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of fehlerhafte vs fehlerhaften

Shared letters: aefhlrt. Private to "fehlerhafte": -. Private to "fehlerhaften": n.

"fehlerhafte" · 11 letters · shape CVCCVCCVCCV  ·  "fehlerhaften" · 12 letters · shape CVCCVCCVCCVC

Known mistypes of this pair

  • fehlerhafteefhlerhafte · fehelrhafte · fehhlerhafte · fehlehrafte · fehlerahfte · fehlerhafet · fehlerhaffte · fehlerhaftte
  • fehlerhaftenefhlerhaften · fehelrhaften · fehhlerhaften · fehlehraften · fehlerahften · fehlerhafetn · fehlerhafften · fehlerhaftenn

Frequently Asked Questions

Is swapping "fehlerhafte" for "fehlerhaften" ever safe?
No. They are said differently ([ˈfeːlɐhaftə] versus [ˈfeːlɐhaftn̩]) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.
In ordinary German text, does "fehlerhafte" or "fehlerhaften" show up more?
"fehlerhafte" is the more common of the two: it sits at frequency rank #21,596 in our German list, against #30,553 for "fehlerhaften". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

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

  • Full dictionary entry for "fehlerhafte" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "fehlerhaften" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #1,108,172 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
  • "fehlerhafte" and "fehlerhaften" also get mixed up with nearby pairs, the highest-scored neighbour is "fehlerhaften vs Fehlverhalten". 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 #1,108,172 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.

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

Source: FrequencyWords open word-frequency list