mental illness
"mental-illness" is a 13-letter English headword indexed on PlainSpell.
The verdict
“mental illness” is outside the top-ranked English vocabulary, used as a noun - the kind of word writers most often double-check.
- Unranked
- below top-frequency English
- 14
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The property of being mentally ill; mental disorders taken as a whole.
| Property | Value |
|---|---|
| Headword | mental illness |
| Language | English |
| Part of speech | Noun |
| Letters | 14 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “mental illness” sits in English frequency
Spelling & Dictionary Insight
The English entry for mental illness is 14 letters long, classified as a noun. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. Wiktionary records 2 distinct senses for this headword, so context determines which meaning a reader should apply.
No generated misspelling entries exist for mental illness in our index, a sign its spelling follows regular English conventions. This headword has no recorded confusable partner, since nothing in our dataset looks or sounds close enough to cause mix-ups.
No explicit etymology string is stored for this entry, so its spelling pattern is best understood through pronunciation rather than a traceable origin. The correct English form is mental illness, spelled M-E-N-T-A-L- -I-L-L-N-E-S-S.
Definition
- 1The property of being mentally ill; mental disorders taken as a whole.
- 2A mental disorder.
This word in other languages
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “mental illness”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is M-E-N-T-A-L- -I-L-L-N-E-S-S - every other letter order is a misspelling in standard orthography.
- Browse more English words and confusable pairs in the same reference. English words
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.