hardness

/ˈhɑɹdnəs/

//ˈhɑɹdnəs// noun

By · According to Wiktionary data (CC BY-SA) ·

"hardness" is a 8-letter English headword indexed on PlainSpell.

The verdict

“hardness” has 11 generated spelling variants in the English index at frequency #23,292. The variants make it a useful spelling check.

#23,292
frequency rank, English
2,646
“H” headwords
11
tracked misspellings
5
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - The quality of being hard.

Corpus desk

Index EN-hardness · hardness · English

hardness · rank #23,292 · 11 variants · 5 confusables

  • FREQ-MID #23,292
  • LEN-LONG 8 letters
  • VOW-2 2 vowels
  • CONFUS-MID 5 pairs
  • VAR-MID 11 variants
  • BOOK-MID 2,646
  • PHOTO-FINISH hairdresser

Nearest frequency peer: hairdresser (-1 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.

Rank peers near misspelling magnet “hardness”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “hardness” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

hardness vs harness
88% similar
hardness vs harmless
75% similar
hardness vs Harkness
75% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for hardness
PropertyValue
Headwordhardness
LanguageEnglish
Part of speechNoun
IPA/ˈhɑɹdnəs/
Letters8
Frequency rank#23,292
Misspellings tracked11
Confusable pairs5
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “hardness”

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).hardnesslands here:

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

Scale is logarithmic (each tick is 10× rarer). Same rarity band neighbours include “hairdresser” (#23,291), “Hahn” (#23,290), “Haryana” (#23,294). Among 2,646 “H” headwords, “hardness” is #23,292. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 11 spelling variants around hardness (IPA /ˈhɑɹdnəs/), anoun. Corpus frequency is #23,292 among 2,646 “H” headwords. Wiktionary lists 7 senses, so context still picks the gloss.

Our generated misspelling index lists 11 likely wrong-spelling variants for hardness, with forms such as "ahrdness", "hadrness", and "harddness". Each variant is a distinct typo pattern an edit-distance generator flags, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution. It also participates in 5 confusable-pair relationships, "harness", "harmless", "Harkness", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: From Middle English hardness, hardnesse, from Old English heardnes, from heard + -nes, equivalent to hard + -ness. The correct English form is hardness, spelled H-A-R-D-N-E-S-S.

Definition

  1. 1
    The quality of being hard.
  2. 2
    An instance of this quality; hardship.
  3. 3
    The quantity of calcium carbonate dissolved in water, usually expressed in parts per million (ppm).
  4. 4
    The resistance to scratching, cutting, indentation or abrasion of a metal or other solid material.
  5. 5
    The penetrating ability of electromagnetic radiation, such as x-rays; generally, the shorter the wavelength, the harder and more penetrating the radiation.
  6. 6
    The measure of resistance to damage of a facility, equipment, installation, or telecommunications infrastructure when subjected to attack.
  7. 7
    A measure of how hard a material is.

Recorded use

Wiktionary examples

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

  1. Who can number the cloudes in wiſedom? or who can ſtay the bottles of heauen, / When the duſt groweeh^([sic – meaning groweth]) into hardneſſe and the clods cleaue faſt together?
  2. The hardness of the material was high.

Etymology

From Middle English hardness, hardnesse, from Old English heardnes, from heard + -nes, equivalent to hard + -ness.

Synonyms

callositydurityfirmnesshardnessindurationinflexibilityrigidityrenitencerenitencystiffnesstemper

Antonyms

softness

This word in other languages

dureza(Español)dureté(Français)Härte(Deutsch)dureza(Português)

Common misspellings

Also misspelled as:

  • ahrdness
  • hadrness
  • harddness
  • hardenss
  • hardnes
  • hardnness
  • hardnses
  • harndess
  • harrdness
  • hhardness
  • hradness

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of hardness - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.

ahrdness2hadrness2harddness1hardenss2hardnes1hardnness1hardnses2harndess2
Edit distance from "hardness"

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 "hardness"?
"hardness" is spelled H-A-R-D-N-E-S-S. The IPA pronunciation is /ˈhɑɹdnəs/.
What does "hardness" mean?
As a noun, "hardness" means: The quality of being hard.
What words are commonly confused with "hardness"?
"hardness" is commonly confused with "harness", "harmless", "Harkness". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "hardness"?
The IPA (International Phonetic Alphabet) transcription for "hardness" is /ˈhɑɹdnəs/. 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 "hardness"?
From Middle English hardness, hardnesse, from Old English heardnes, from heard + -nes, equivalent to hard + -ness. 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 "hardness", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 8 letters (nearest by frequency rank).

Guerrero#23,287furthest#23,278frontman#23,277footnote#23,273

Similar misspelling depth

Headwords with a similar count of attested misspellings (11 here; floor ≥5).

glanced11 variantshotspot11 variantsesoteric11 variantsKershaw11 variants

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

Source: FrequencyWords open word-frequency list