• WordNet 3.6
    • adj obtuse slow to learn or understand; lacking intellectual acuity "so dense he never understands anything I say to him","never met anyone quite so dim","although dull at classical learning, at mathematics he was uncommonly quick"- Thackeray","dumb officials make some really dumb decisions","he was either normally stupid or being deliberately obtuse","worked with the slow students"
    • adj obtuse lacking in insight or discernment "too obtuse to grasp the implications of his behavior","a purblind oligarchy that flatly refused to see that history was condemning it to the dustbin"- Jasper Griffin"
    • adj obtuse of an angle; between 90 and 180 degrees
    • adj obtuse (of a leaf shape) rounded at the apex
    • ***
Webster's Revised Unabridged Dictionary
    • Obtuse Dull; deadened; as, obtuse sound.
    • Obtuse Not having acute sensibility or perceptions; not alert, especially to the feelings of others; dull; stupid; as, obtuse senses.
    • Obtuse Not pointed or acute; blunt; -- applied esp. to angles greater than a right angle, or containing more than ninety degrees.
    • ***
Century Dictionary and Cyclopedia
    • obtuse Blunt; not acute or pointed: applied to an angle, it denotes one that is larger than a right angle, or of more than 90°. See cuts under angle.
    • obtuse In botany, blunt, or rounded at the extremity: as, an obtuse leaf, sepal, or petal.
    • obtuse Dull; lacking in acuteness of sensibility: stupid: as, he is very obtuse; his perceptions are obtuse.
    • obtuse Not shrill; obscure; dull: as, an obtuse sound.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Obtuse ob-tūs′ blunt: not pointed: :
    • adj Obtuse ob-tūs′ (bot.) blunt or rounded at the point, as a leaf: stupid: not shrill
    • adj Obtuse ob-tūs′ (geom.) greater than a right angle
    • ***


Webster's Revised Unabridged Dictionary
L. obtusus, p. p. of obtundere, to blunt: cf. F. obtus,. See Obtund
Chambers's Twentieth Century Dictionary
Fr.,—L. obtususobtundĕre, to blunt—ob, against, tundĕre, to beat.


In literature:

Patty, not being an obtuse young person, saw through all this, and chose to be amused by it.
"Patty's Summer Days" by Carolyn Wells
The latter consists of an outer breakwater, forming an obtuse angle nearly two miles in length.
"Shepp's Photographs of the World" by James W. Shepp
It shows an obtuseness of conscience.
"Thoughts on Missions" by Sheldon Dibble
Obtuse as he was, he saw at a glance what had occurred.
"A Son of Hagar" by Sir Hall Caine
The tops of these posts are obtusely beveled to an edge, and at the bottom they are notched to correspond.
"Peat and its Uses as Fertilizer and Fuel" by Samuel William Johnson
Her poetry is sure to be unintelligible, and I should expose my obtuseness of intellect.
"Vixen, Volume I." by M. E. Braddon
The Duchess was admiring but somewhat obtuse, and rarely admired in the right place.
"Vixen, Volume III." by M. E. Braddon
Then we like to blame our friends or the fates for our poor judgment and our obtuseness.
"Cupology" by Clara
It will thus be perceptible that the best shape will be rather obtuse but very smooth.
"The Repairing & Restoration of Violins" by Horace Petherick
It was full two yards about, it stood as high as Eudena's waist, it was obtuse-angled and toothed with flints.
"Tales of Space and Time" by Herbert George Wells

In poetry:

Where am I now? And what
Am I to say portends?
Death is but death, and not
The most obtuse of ends.
"A Song In Passing" by Yvor Winters
The mystery she holds
For him, inveterately he strains to see,
And sight of his obtuseness is the key
Among those folds.
"Earth And Man" by George Meredith
Be faithful and the great Grand Master
Will on his trestle-board make plain
All that's obtuse, but no whit faster
Than 'twere needful to explain.
"Admonition" by James Madison Bell
Be but faithful, and the Great Grand Master
Will on his trestle board make plain
All that's obtuse, but no whit faster
Than 'twere needful to explain.
"The Future Of America, In The Unity Of The Races" by James Madison Bell
'Listen, now, verse should be as natural
As the small tuber that feeds on muck
And grows slowly from obtuse soil
To the white flower of immortal beauty.'
"Poetry for Supper" by R S Thomas
When warm'd with zeal, my rustic Muse
Feels fluttering fain to tell her news,
And paint her simple, lowly views
With all her art,
And, though in genius but obtuse,
May touch the heart.
"Epistle To The Rev. J--- B---, Whilst Journeying For The Recovery Of His Health" by Patrick Branwell Bronte

In news:

An arty , obtuse take on 'Wuthering Heights.
Robert Pattinson must be hellbent on escaping the world of sparkly-skinned undead to take on the starring role in the leaden, obtuse and ultra-pretentious Cosmopolis (*1/2 out of four.
Of George W Bush's many obtuse utterances, few were more revealing than one he made to Scott Pelley of 60 Minutes in January 2007.
I think you're being obtuse Eliot: Are you calling me "obtuse".
And blindly, deficiently, obtusely wrong.
An arty, obtuse take on 'Wuthering Heights.
'Ghosts of Ole Miss' Comes Off as Obtuse .
Still obtuse about standardized testing.
Obama administration needs to stop being obtuse on drilling rules: An editorial.
Everyone who disagrees with me is stupid or morally obtuse .
Obtuse art within the Jefferson County Courthouse jail.
In their ongoing debate about Romneycare, David Frum has penned a remarkably obtuse response to AmSpec alum Phil Klein.
Still Employed Due to Gutless, Obtuse Leadership at MSU.
A politically obtuse, verbally abusive, filthy rich one, but a mensch nonetheless.
Everyone who disagrees with me is stupid or morally obtuse.

In science:

In Section 3 we introduce the basic algebric tool: the obtuse random walk which are an appropriate “basis” of random walks adapted to this language.
Repeated Quantum Interactions and Unitary Random Walks
Hence, a random variable X satisfying one of the above condition is called an obtuse random variable.
Repeated Quantum Interactions and Unitary Random Walks
We claimed above that obtuse random variables are a kind of basis for the random variables in RN in general.
Repeated Quantum Interactions and Unitary Random Walks
The obtuse random walks admit a very simple and natural representation in terms of the operators ai j (n) defined in Section 2.2.
Repeated Quantum Interactions and Unitary Random Walks
Theorem 3.4 Let X be an obtuse random variable in RN and let (Xp )p∈N be the associated random walk on the canonical space T Φ(X ).
Repeated Quantum Interactions and Unitary Random Walks