illvsimWhich spelling fits?

Quick tell: ill is a adverb, im is an abbrev, so they fill different roles in a sentence.

Which to use

“ill” is an adverb and “im” is an abbrev - they look or sound alike but fill different roles in a sentence.

#25,175
“ill” frequency rank
#17
“im” frequency rank
25192
confusion score

Side-by-Side Comparison

Feature ill im
Definition schlecht, falsch Position innerhalb einer genannten Zeitspanne - wann?

Where the eye mixes ill and im

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

3 ch
ill
2 ch
im

Visual trap between ill and im

These two trip readers on the page rather than in the ear: ill is [ɪl] while im is [ɪm]. 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 (adverb vs abbrev), which is usually the fastest check. Our composite confusion score for this pair is 25192, derived from the frequency rank of both members and their visual similarity.

ill is recorded at frequency rank #25,175, classified as anadv, pronounced [ɪl]. im is at rank #17, tagged as anabbrev, pronounced [ɪm].

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 25192, this pair ranks #1,836,832 of 2,006,359 scored German confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of ill vs im

Shared letters: i. Private to "ill": l. Private to "im": m.

"ill" · 3 letters · shape VCC  ·  "im" · 2 letters · shape VC

Frequently Asked Questions

Do "ill" and "im" mean the same thing in a sentence?
No - they are not even the same part of speech. "ill" is an adverb and "im" an abbrev, so a sentence built for one is usually ungrammatical with the other.
In ordinary German text, does "ill" or "im" show up more?
"im" is the more common of the two: it sits at frequency rank #17 in our German list, against #25,175 for "ill". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

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 "ill" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "im" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #1,836,832 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
  • "ill" and "im" also get mixed up with nearby pairs, the highest-scored neighbour is "ill vs IMs". Nearby pair

Confusion rank #1,836,832 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