stiffen

/ˈstɪfən/

//ˈstɪfən// verb

"stiffen" is a 7-letter English headword indexed on PlainSpell.

The verdict

“stiffen” is uncommon English (frequency #53,879 among 6,566 “S” headwords), classed as a verb. The kind of spelling people second-guess.

#53,879
frequency rank, English
6,566
“S” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - To make stiff.

Corpus desk

Index EN-stiffen · stiffen · English

stiffen · rank #53,879 · 0 variants · 0 confusables

  • FREQ-RARE #53,879
  • LEN-LONG 7 letters
  • VOW-2 2 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-DENSE 6,566
  • PHOTO-FINISH Stavros

Nearest frequency peer: Stavros (-2 rank slots)

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.

Long-tail ranks near “stiffen”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

What this shows Long-tail view: where “stiffen” sits against similarly uncommon English ranks.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for stiffen
PropertyValue
Headwordstiffen
LanguageEnglish
Part of speechVerb
IPA/ˈstɪfən/
Letters7
Frequency rank#53,879
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “stiffen” in English

This scale runs from the tiny cluster of words that carry ordinary speech (left) to the long tail of words almost nobody reaches for (right).stiffenfalls in this rarity band:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Rare peers in the same band: “Stavros” (#53,877), “stammer” (#53,874), “stupider” (#53,884). Among 6,566 “S” headwords, “stiffen” is #53,879. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

stiffen is uncommon English at frequency #53,879 among 6,566 “S” headwords, classed as averb, transcribed /ˈstɪfən/. Rarity is why readers land here mid-draft. 2 senses are on record.

The misspelling generator found no plausible variants for stiffen, since its letter sequence doesn't invite the usual edit-distance slips. This entry stands alone in our confusable dataset, which typically means the spelling is too distinctive to be mistaken for another word.

Etymologically, the entry records: From Middle English stifnen, equivalent to stiff + -en. The correct English form is stiffen, spelled S-T-I-F-F-E-N.

Definition

  1. 1
    To make stiff.
  2. 2
    To become stiff.

Recorded use

Wiktionary examples

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

  1. Criminal prosecutions of abusers are generally the responsibility of local authorities, but the act stiffened sentences for stalking under federal law.
  2. It followed a sequence of functions: a machine cuts cloth panels to be sewn, the panels are drenched with the polymer and stiffened, a robotic arm uses suction cups to lift each panel and position it in a sewing machine. Finally, the robotic arm lifts the stitched T-shirt off the sewing machine. […] The system could work for most fabrics, with the excepti…

Etymology

From Middle English stifnen, equivalent to stiff + -en.

Synonyms

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); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "stiffen"?
"stiffen" is spelled S-T-I-F-F-E-N. The IPA pronunciation is /ˈstɪfən/.
What does "stiffen" mean?
As a verb, "stiffen" means: To make stiff.
How do you pronounce "stiffen"?
The IPA (International Phonetic Alphabet) transcription for "stiffen" is /ˈstɪfən/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "stiffen"?
From Middle English stifnen, equivalent to stiff + -en. 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.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "stiffen", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 7 letters (nearest by frequency rank).

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

Source: FrequencyWords open word-frequency list