Definition

1. Noun:
   • The quality of lacking a sharp edge or point: The state of being blunt or not sharp.
   • The quality of being slow to understand: The state of being dull in perception, intellect, or sensitivity; a lack of quickness or acuity in comprehension.

Examples of Usage

• Noun:
  • The obtuseness of the old kitchen knife made cutting vegetables difficult. (Here, 'obtuseness' refers to the physical bluntness of the knife.)
  • His obtuseness to social cues often led to awkward situations. (Here, 'obtuseness' refers to a slowness in understanding subtle hints.)
  • The professor was frustrated by the student's apparent obtuseness regarding the fundamental concept.

Advanced Usage

• "Mathematical obtuseness": In geometry, this can refer to the property of an angle being obtuse (greater than 90 degrees), though the noun form 'obtuseness' is less common than the adjective 'obtuse' in this technical context.
  • The obtuseness of the angle in the diagram was clearly marked.
• "Emotional obtuseness": A lack of sensitivity or awareness regarding the feelings of others.
  • His emotional obtuseness prevented him from realizing he had caused offense.

Variants and Related Words

• Obtuse (adj): The adjective form.
  • Not sharp-pointed or sharp-edged; blunt.
  • (Of an angle) more than 90° and less than 180°.
  • Annoyingly insensitive or slow to understand.
• Obtusely (adv): In an obtuse manner.
  • He obtusely ignored all the warning signs.

Synonyms

• Dullness: Lack of sharpness (physical) or intellectual quickness.
• Bluntness: The quality of having a thick edge or point; can also imply a direct, insensitive manner in speech.
• Stupidity: A stronger, more derogatory term for a lack of intelligence.
• Insensitivity: Lack of awareness or concern for others' feelings.

Antonyms

• Sharpness: The quality of having a fine edge or point; keen intelligence.
• Acuteness: Keenness of perception, understanding, or insight.
• Sensitivity: Quickness to detect or respond to slight changes, signals, or influences; awareness of others' feelings.

Related Idioms and Phrases

• "To be obtuse": This common phrase uses the adjective form to describe someone who is deliberately or unintentionally slow to understand.
  • Don't be obtuse; you know exactly what I mean.
• "A display of obtuseness": An instance showing a lack of understanding.
  • His failure to grasp the simple instructions was a remarkable display of obtuseness.

Noun

1. the quality of lacking a sharp edge or point
2. the quality of being slow to understand