Which to use
“underlie” and “undermine” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #42,970
- “underlie” frequency rank
- #12,161
- “undermine” frequency rank
- 55131
- confusion score
Side-by-Side Comparison
| Feature | underlie | undermine |
|---|---|---|
| Definition | To lie in a position directly beneath something. | To dig underneath (something), to make a passage for destructive or military purposes; to sap. |
Where the eye mixes underlie and undermine
Muted = shared; highlighted = the visual trap. They share 7 letters in sequence. underlie runs 8 letters (VCCVCCVV) against undermine's 9 (VCCVCCVCV) - the length gap alone is often enough to separate them once you know to check it.
Look-alike desk: underlie vs undermine
A purely visual mix-up. underlie (/ˌʌn.dəˈlaɪ/) and undermine (/ˌʌn.dəˈmaɪn/) 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 letter(s) in length. Our composite confusion score for this pair is 55131, derived from the frequency rank of both members and their visual similarity.
underlie is recorded at frequency rank #42,970, classified as averb, pronounced /ˌʌn.dəˈlaɪ/. undermine is at rank #12,161, tagged as averb, pronounced /ˌʌn.dəˈmaɪn/.
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 55131, this pair ranks #135,974 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of underlie vs undermine
Shared letters: deinru. Private to "underlie": l. Private to "undermine": m.
"underlie" · 8 letters · shape VCCVCCVV · "undermine" · 9 letters · shape VCCVCCVCV
Known mistypes of this pair
Frequently Asked Questions
Is swapping "underlie" for "undermine" ever safe?
Frequency check: "underlie" vs "undermine" - which ranks higher?
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 "underlie" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "undermine" - compare definitions side by side with the headword page. Word entry
- This pair ranks #135,974 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "underlie" and "undermine" also get mixed up with nearby pairs, the highest-scored neighbour is "underlie vs underpin". 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 #135,974 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.