untersuchenvsuntersuchtWhich spelling fits?

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

Which to use

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

#4,393
“untersuchen” frequency rank
#3,000
“untersucht” frequency rank
7393
confusion score

Side-by-Side Comparison

Feature untersuchen untersucht
Definition etwas analysieren oder erforschen, sich etwas sehr genau anschauen, um es zu verstehen analysiert oder erforscht worden; unter die Lupe genommen

Where the eye mixes untersuchen and untersucht

Muted = shared; highlighted = the visual trap. They share 9 letters in sequence. untersuchen runs 11 letters (VCCVCCVCCVC) against untersucht's 10 (VCCVCCVCCC) - the length gap alone is often enough to separate them once you know to check it.

11 ch
untersuchen
10 ch
untersucht

Visual trap between untersuchen and untersucht

These two trip readers on the page rather than in the ear: untersuchen is [ˌʊntɐˈzuːxn̩] while untersucht is [ʊntɐˈzuːxt]. 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 (verb vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 7393, derived from the frequency rank of both members and their visual similarity.

untersuchen is recorded at frequency rank #4,393, classified as averb, pronounced [ˌʊntɐˈzuːxn̩]. untersucht is at rank #3,000, tagged as anadj, pronounced [ʊntɐˈzuːxt].

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 7393, this pair ranks #1,988,325 of 2,006,359 scored German confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of untersuchen vs untersucht

Shared letters: cehnrstu. Private to "untersuchen": -. Private to "untersucht": -.

"untersuchen" · 11 letters · shape VCCVCCVCCVC  ·  "untersucht" · 10 letters · shape VCCVCCVCCC

Known mistypes of this pair

  • untersuchen ← nutersuchen · unetrsuchen · unntersuchen · unterrsuchen · unterscuhen · unterssuchen · untersucchen · untersucehn
  • untersucht ← nutersucht · unetrsucht · unntersucht · unterrsucht · unterscuht · unterssucht · untersuccht · untersuchht

Frequently Asked Questions

Can "untersuchen" and "untersucht" be used interchangeably?
No - they are not even the same part of speech. "untersuchen" is a verb and "untersucht" an adjective, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "untersuchen" or "untersucht"?
"untersucht" is the more common of the two: it sits at frequency rank #3,000 in our German list, against #4,393 for "untersuchen". 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 "untersuchen" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "untersucht" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #1,988,325 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
  • "untersuchen" and "untersucht" also get mixed up with nearby pairs, the highest-scored neighbour is "untersuchen vs untertauchen". 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 #1,988,325 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