non compos mentis
"non-compos-mentis" is a 15-letter English headword indexed on PlainSpell.
The verdict
“non compos mentis” is uncommon English (outside the top frequency list), classed as an adjective. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 17
- letters
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Insane; not of sound mind; not in control of oneself.
Corpus desk
Index EN-non-compos-mentis · non compos mentis · English
non compos mentis · unranked · 0 variants · 0 confusables
- FREQ-UNRANKED Unranked
- LEN-MEGA 17 letters
- VOW-5 5 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-THIN "N" thin
- PHOTO-UNK Peer pending
Read with this headword: Spelling guide for this pattern
Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.
| Property | Value |
|---|---|
| Headword | non compos mentis |
| Language | English |
| Part of speech | Adjective |
| Letters | 17 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “non compos mentis” in English
Rare enough to double-check
non compos mentis is uncommon English outside the top frequency list, classed as anadjective. Rarity is why readers land here mid-draft. Gloss: "Insane; not of sound mind; not in control of oneself.".
Zero misspellings are on record for non compos mentis in our index, and the word's spelling is regular enough that our generator found nothing worth flagging. It is not paired with a close-neighbour confusable in our dataset, which tends to mean the word is visually distinctive enough to stand on its own.
Etymologically, the entry records: From Latin non (“not”) + compos (“in control, having mastery”) + mentis (“of mind”). The correct English form is non compos mentis, spelled N-O-N- -C-O-M-P-O-S- -M-E-N-T-I-S.
Definition
- 1Insane; not of sound mind; not in control of oneself.
Etymology
From Latin non (“not”) + compos (“in control, having mastery”) + mentis (“of mind”).
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.