undeterminate

adj

"undeterminate" is a 13-letter English headword indexed on PlainSpell.

The verdict

“undeterminate” is uncommon English (outside the top frequency list), classed as an adjective. The kind of spelling people second-guess.

Unranked
below top-frequency English
13
letters

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Not determinate; unsettled or uncertain.

Corpus desk

Index EN-undeterminate · undeterminate · English

undeterminate · unranked · 0 variants · 0 confusables

  • FREQ-UNRANKED Unranked
  • LEN-MEGA 13 letters
  • VOW-6 6 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-THIN "U" 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.

Key facts for undeterminate
PropertyValue
Headwordundeterminate
LanguageEnglish
Part of speechAdjective
Letters13
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “undeterminate” in English

undeterminatesits beyond the 100,000 most-frequent English words, in the long tail of technical, archaic, or otherwise rare vocabulary where spelling doubt tends to strike hardest.

Beyond rank #100,000. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

undeterminate is uncommon English outside the top frequency list, classed as anadjective. Rarity is why readers land here mid-draft. Gloss: "Not determinate; unsettled or uncertain.".

undeterminate doesn't appear in our generated misspelling index, suggesting the orthography follows predictable English patterns. 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 un- + determinate. The correct English form is undeterminate, spelled U-N-D-E-T-E-R-M-I-N-A-T-E.

Definition

  1. 1
    Not determinate; unsettled or uncertain.

Recorded use

Wiktionary example

These source excerpts show how undeterminate appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. "[…] I think I may safely infer, That whatever is the first and principal Cause of changing the fluid and undeterminated Matter into shapes so comely and symmetrical, as we see in Flowers and Trees, is an Understanding Principle […]

Etymology

From un- + determinate.

Antonyms

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

How do you spell "undeterminate"?
"undeterminate" is spelled U-N-D-E-T-E-R-M-I-N-A-T-E.
What does "undeterminate" mean?
As an adjective, "undeterminate" means: Not determinate; unsettled or uncertain.
What is the origin of the word "undeterminate"?
From un- + determinate. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list