die Rauigkeit, -en

Rauigkeit means roughness or coarseness—the quality of being not smooth. It can refer both to physical texture and to a harsh manner or tone.

1) Physical meaning (surface/texture)

• English: roughness, coarse texture, abrasiveness
• Use: describing materials or surfaces that feel uneven or scratchy.
  • die Rauigkeit einer Wand = the roughness of a wall

2) Figurative meaning (behavior/speech)

• English: harshness, brusqueness, gruffness
• Use: describing an unfriendly, blunt, or abrasive way of speaking or behaving.
  • die Rauigkeit im Ton = harshness in the tone

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Word parts (composition)

• rau = rough, coarse; also: harsh (in tone)
• -igkeit = a suffix forming nouns meaning a state/quality (like “-ness” in English)

So Rauigkeit literally means “rough-ness.”

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German synonyms

Physical

• Unebenheit (unevenness)
• Oberflächenrauheit (surface roughness; technical)
• Rauhheit (roughness; close variant)
• Schroffheit (can be physical “ruggedness,” also figurative)

Figurative

• Schroffheit (harshness, brusqueness)
• Herbheit (tartness/harshness, often in tone)
• Grobheit (rudeness, coarseness)
• Unfreundlichkeit (unfriendliness)

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German antonyms (if applicable)

Physical

• Glätte (smoothness)
• Glatheit (smoothness)
• Ebenheit (evenness, flatness)

Figurative

• Freundlichkeit (friendliness)
• Höflichkeit (politeness)
• Sanftheit (gentleness)