undutiful

adj

"undutiful" is a 9-letter English headword indexed on PlainSpell.

The verdict

“undutiful” is outside the top-ranked English vocabulary, used as an adjective - the kind of word writers most often double-check.

Unranked
below top-frequency English
9
letters

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Not dutiful.

Key facts for undutiful
PropertyValue
Headwordundutiful
LanguageEnglish
Part of speechAdjective
Letters9
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “undutiful” sits in English frequency

undutiful falls outside the top-100,000 ranked English words, the long-tail zone of technical, archaic, or low-frequency vocabulary, exactly where readers second-guess spellings most.

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

Spelling & Dictionary Insight

The English entry for undutiful is 9 letters long, classified as an adjective. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. The dominant gloss from Wiktionary reads: "Not dutiful.".

No misspelling variants are generated for undutiful in our index, since its letter sequence doesn't invite the usual edit-distance slips. It is not paired with a close-neighbour confusable in our dataset, which typically means the spelling is too distinctive to be mistaken for another word.

Etymologically, the entry records: From un- + dutiful. The correct English form is undutiful, spelled U-N-D-U-T-I-F-U-L.

Definition

  1. 1
    Not dutiful.

Etymology

From un- + dutiful.

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 "undutiful"?
"undutiful" is spelled U-N-D-U-T-I-F-U-L.
What does "undutiful" mean?
As an adjective, "undutiful" means: Not dutiful.
What is the origin of the word "undutiful"?
From un- + dutiful. 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.

Using “undutiful”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is U-N-D-U-T-I-F-U-L - 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.

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

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list