hardness
C1Formal, Technical, Academic
Definition
Meaning
The physical quality of being solid, firm, and difficult to scratch, bend, or cut.
The quality of being severe, strict, or harsh; lacking in compassion; difficulty or arduousness of a situation; the mineralogical measurement of a substance's resistance to deformation.
Linguistics
Semantic Notes
Primarily a noun denoting a property or quality. Its primary physical sense often involves measurable scales (e.g., Mohs hardness scale). Metaphorical senses (e.g., 'hardness of heart') carry strong evaluative connotations, often negative.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Spelling is consistent.
Connotations
Identical connotations in both varieties.
Frequency
Slightly more frequent in technical/scientific contexts (engineering, geology, materials science) in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
the hardness of [NOUN PHRASE][ADJECTIVE] hardnesshardness against [NOUN]hardness on the Mohs scaleVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “Hardness of heart”
- “A heart of stone (related conceptual idiom)”
Usage
Context Usage
Business
Rare; may appear in contexts like 'the hardness of the market' or 'negotiating hardness.'
Academic
Common in materials science, geology, engineering, and metallurgy papers. Also in literary criticism (e.g., 'the hardness of the protagonist's character').
Everyday
Used for physical objects (e.g., testing the hardness of a worktop) and metaphorically for people's attitudes.
Technical
Core term in materials science; refers to quantifiable properties measured by Vickers, Brinell, Rockwell, or Mohs scales.
Examples
By Part of Speech
verb
British English
- The steel is case-hardened to increase its surface hardness.
- The water in this region hardens the pipes due to mineral deposits.
American English
- They hardened the alloy to achieve the desired hardness.
- The policy hardened their opposition.
adverb
British English
- He hit the metal hard to test its implied hardness.
- They worked hard all day.
American English
- She trained hard for the marathon.
- The frost bit hard into the ground.
adjective
British English
- The hard granite was tested for its mineral hardness.
- He has a hard, uncompromising attitude.
American English
- The hard surface showed no scratch in the hardness test.
- It was a hard decision to make.
Examples
By CEFR Level
- The hardness of the desk surprised me.
- This bread has a strange hardness.
- We measured the hardness of different types of wood.
- The hardness of his voice made me nervous.
- Diamond has the highest rating on the Mohs scale of mineral hardness.
- The critic noted the moral hardness of the novel's main character.
- The metallurgist explained how tempering affects the hardness and toughness of the steel differently.
- His political stance was characterised by an unyielding hardness that alienated potential allies.
Learning
Memory Aids
Mnemonic
Think of a HARD NESS (a promontory made of rock) – a place that is physically hard and unyielding.
Conceptual Metaphor
DIFFICULTY IS HARDNESS (a hard problem), LACK OF EMOTION IS HARDNESS (a hard heart), SEVERITY IS HARDNESS (hard frost).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'трудность' (difficulty) in all contexts. Use 'трудность' for abstract challenges, 'твёрдость' for physical property and stubbornness.
- In technical contexts, 'hardness' is specifically 'твёрдость' (measurable property), not 'прочность' (strength/durability).
Common Mistakes
- Using 'hardness' to mean 'difficulty' in a non-metaphorical way (e.g., 'the hardness of the exam' is less idiomatic than 'the difficulty').
- Confusing 'hardness' (resistance to scratching) with 'toughness' (resistance to fracture).
Practice
Quiz
In which context is the word 'hardness' MOST likely to be used with a precise numerical value?
FAQ
Frequently Asked Questions
In materials science, 'hardness' specifically refers to a material's resistance to surface deformation or scratching (e.g., Vickers test). 'Strength' refers to its ability to withstand an applied force without failing or yielding (e.g., tensile strength). A material can be hard but not strong (brittle), or strong but not hard (ductile).
Yes, 'water hardness' is a common technical term. It refers to the concentration of dissolved calcium and magnesium ions. Hard water causes limescale and reduces soap's lathering ability.
It is almost always negative, implying a lack of empathy, flexibility, or compassion. It suggests coldness, sternness, and unyielding attitudes (e.g., 'the hardness in his eyes').
It is almost exclusively an uncountable (mass) noun. You do not say 'hardnesses'. You refer to 'a degree of hardness' or 'different levels of hardness'.