[uhb-toos, -tyoos]
not quick or alert in perception, feeling, or intellect; not sensitive or observant; dull.
not sharp, acute, or pointed; blunt in form.
(of a leaf, petal, etc.) rounded at the extremity.
indistinctly felt or perceived, as pain or sound.

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)
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]

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Word Origin & History

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-)

  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
When females have been candid with me, they often cite my rather obtuse ways of
  carrying on a conversation.
It might even be the actual dominant life form on this planet, and we're simply
  too obtuse to be aware of it.
Their words were obtuse and the presentations circuitous.
It doesn't matter whether the angle joining them is obtuse or acute.
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