1. not quick or alert in perception, feeling, or intellect; not sensitive or observant; dull.
  2. not sharp, acute, or pointed; blunt in form.
  3. (of a leaf, petal, etc.) rounded at the extremity.
  4. indistinctly felt or perceived, as pain or sound.


  1. mentally slow or emotionally insensitive
  2. maths
    1. (of an angle) lying between 90° and 180°
    2. (of a triangle) having one interior angle greater than 90°
  3. not sharp or pointed
  4. indistinctly felt, heard, etc; dullobtuse pain
  5. (of a leaf or similar flat part) having a rounded or blunt tip

adj.early 15c., “dull, blunted,” from Middle French obtus (fem. obtuse), from Latin obtusus “blunted, dull,” also used figuratively, past participle of obtundere “to beat against, make dull,” from ob “against” (see ob-) + tundere “to beat,” from PIE *(s)tud-e- “to beat, strike, push, thrust,” from root *(s)teu- “to push, stick, knock, beat” (cf. Latin tudes “hammer,” Sanskrit tudati “he thrusts”). Sense of “stupid” is first found c.1500. Related: Obtusely; obtuseness. adj.

  1. Lacking quickness of perception or intellect.
  2. Not sharp or acute; blunt.
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