hardness

difficulty

ˈdɪfɪk(ə)lti

noun

the state or condition of being difficult.

Guy had no difficulty in making friends

strain,struggling,awkwardness,trouble,toil,labour,laboriousness,strenuousness,arduousness,pains,problems,trials and tribulations,hassle,stress,dolour,travails,complexity,complicatedness,intricacy,perplexity,knottiness,difficultness,trickiness,hardness,obscurity,abstruseness

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difficulties

ˈdɪfɪk(ə)lti

noun

the state or condition of being difficult.

Guy had no difficulty in making friends

strain,struggling,awkwardness,trouble,toil,labour,laboriousness,strenuousness,arduousness,pains,problems,trials and tribulations,hassle,stress,dolour,travails,complexity,complicatedness,intricacy,perplexity,knottiness,difficultness,trickiness,hardness,obscurity,abstruseness

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density

ˈdɛnsɪti

noun

the degree of compactness of a substance.

a reduction in bone density

solidity,solidness,denseness,thickness,substance,bulk,weight,mass,compactness,tightness,hardness

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densities

ˈdɛnsɪti

noun

the degree of compactness of a substance.

a reduction in bone density

solidity,solidness,denseness,thickness,substance,bulk,weight,mass,compactness,tightness,hardness

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