Hardness synonyms

toughness

(Uncountable) The state of being tough

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severity

Strictness; harshness

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severeness

The property of being severe.

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stiffness

Rigidity or a measure of rigidity.

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unfeelingness

The state or condition of being unfeeling.

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softness (antonym)

The quality of being soft.

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ductility (related)

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stringency

A tightness or constriction

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tensile (related)

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porosity (related)

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fineness (related)

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brinell (related)

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formability (related)

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flexural (related)

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compressive (related)

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fastness

The condition or quality of being fast, especially:

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1

firmness

The state of being firm; strength; permanence; stability; hardness; resolution.

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1

security

Security is defined as being free from danger, or feeling safe.

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soundness

(Uncountable) The state or quality of being sound.

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stability

Stability is the state of being resistant to change and not prone to wild fluctuations in emotion.

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stableness

Part or all of this entry has been imported from the 1913 edition of Webster's Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.

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steadiness

The state of being steady

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strength

Intensity of emotion or belief:

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sturdiness

The state or quality of being sturdy.

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sureness

(Uncountable) The property of being sure, certainty.

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austerity

An austere act, habit, practice, or manner

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harshness

The quality of being harsh.

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rigidity

The quality or state of being rigid; want of pliability; the quality of resisting change of form; the amount of resistance with which a body opposes change of form.

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rigor

Extreme hardship or difficulty

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rigorousness

The property of being rigorous, strictness.

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sternness

(Uncountable) The state or quality of being stern.