obtuse

[uhb-toos, -tyoos]
adjective
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.

Origin:
1500–10; < Latin obtūsus dulled (past participle of obtundere), equivalent to ob- ob- + tūd-, variant stem of tundere to beat + -tus past participle suffix, with dt > s

obtusely, adverb
obtuseness, noun
subobtuse, adjective
subobtusely, adverb
subobtuseness, noun

abstruse, obtuse.


1. unfeeling, tactless, insensitive; blind, imperceptive, unobservant; gauche, boorish; slow, dim.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
obtuse (əbˈtjuːs)
 
adj
1.  mentally slow or emotionally insensitive
2.  maths
 a.  (of an angle) lying between 90° and 180°
 b.  (of a triangle) having one interior angle greater than 90°
3.  not sharp or pointed
4.  indistinctly felt, heard, etc; dull: obtuse pain
5.  (of a leaf or similar flat part) having a rounded or blunt tip
 
[C16: from Latin obtūsus dulled, past participle of obtundere to beat down; see obtund]
 
ob'tusely
 
adv
 
ob'tuseness
 
n

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Etymonline
Word Origin & History

obtuse
c.1500, from M.Fr. obtus (fem. obtuse), from L. obtusus "blunted, dull," pp. of obtundere "to beat against, make dull," from ob "against" + tundere "to beat," from PIE *(s)tud- "to beat, strike, push, thrust" (cf. L. tudes "hammer," Skt. tudati "he thrusts"). Sense of "stupid" is first found c.1500.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

obtuse ob·tuse (ŏb-tōōs', -tyōōs', əb-)
adj.

  1. Lacking quickness of perception or intellect.

  2. Not sharp or acute; blunt.


ob·tuse'ness n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The human inability to detect these chemical distress calls indicate nothing
  but our own obtuseness.
We should never underestimate the obtuseness of those who would politicize
  science.
Instead, a kind of emotional obtuseness that leads to all sorts of offputting
  behaviors.
From anger and the stress that weighed on me during that time, and from the
  obtuseness of the uninvited.
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