obtuse, adj.
View as: Outline |Full entryKeywords: On |OffQuotations: Show all |Hide all
Pronunciation: Brit. /əbˈtjuːs/, /ɒbˈtjuːs/, /əbˈtʃuːs/, /ɒbˈtʃuːs/,
U.S. /əbˈt(j)us/, /ɑbˈt(j)us/
Frequency (in current use):
Origin: A borrowing from Latin. Etymon: Latin obtūsus.
Etymology: < classical Latin obtūsus blunt, dull, stupid, (of an angle)
greater than 90 degrees and less than 180 degrees, use as adjective of
past participle of obtundere obtund v. Compare Middle French, French obtus
, obtuse blunt (c1370 in Chauliac; compare quot. ?a1425 at sense 1a),
dull, stupid (1532), (of an angle) greater than 90 degrees and less than
180 degrees (1542), indistinctly perceived (c1550 in Paré).
With obtuse-lobate (see Special uses 2) compare earlier obtusilobous adj.
at obtusi- comb. form .
(Show Less)
1.
Thesaurus »
Categories »
a. Chiefly Botany and Zoology. Not sharp or pointed, blunt.
?a1425 tr. Guy de Chauliac Grande Chirurgie (N.Y. Acad. Med.) f. 78v
Þo [instruments]..he calleþ ciryngathoma, bycopez, curue, suple, & obtuse,
i. blont [?c1425 Paris dulle; L. obtusos], byhynde & at þe ende & not sharp.
1589 G. Puttenham Arte Eng. Poesie ii. xi. 84 Such shape as might not
be sharpe..to passe as an angle, nor so large or obtuse as might not essay
some issue out with one part moe then other as the rounde.
1657 S. Purchas Theatre Flying-insects 6 Their tails are somewhat
sharp (the Drones more obtuse).
1660 R. Boyle New Exper. Physico-mechanicall xxxix. 322 An Oval (1858)
Glass..with a short Neck at the obtuser end.
1753 Chambers's Cycl. Suppl. at Leaf Obtuse Leaf, one terminated by
the segment of a circle.
1767 B. Gooch Pract. Treat. Wounds I. 237 A blow with an obtuse weapon.
1806 Philos. Trans. (Royal Soc.) 96 427 This socket..supports the
whole weight of the moveable part of the instrument, which revolves on an
obtuse point at the bottom.
?1877 F. E. Hulme Familiar Wild Flowers I. Summary p. viii Spur stout,
obtuse.
1961 J. Stubblefield Davies's Introd. Palaeontol. (ed. 3) v. 130 The
marginal border of the cephalon is drawn out into an obtuse point in front.
1997 Jrnl. Ecol. 85 531/1 Leaves..oblong-ovate to lanceolate, cordate
at base, crenate-serrate, apex acute or obtuse.
(Hide quotations)
Thesaurus »
Categories »
b. Geometry. Of a plane angle: greater than 90 degrees and less than 180
degrees. Frequently in obtuse angle.
1570 H. Billingsley tr. Euclid Elements Geom. i. f. 2v An obtuse angle
is that which is greater then a right angle.
1633 P. Fletcher Purple Island iii. xxi. 34 Into two obtuser angles
bended.
1701 N. Grew Cosmol. Sacra ii. v. §18 All Salts are Angular; with
Obtuse, Right, or Acute Angles.
1790 Nat. Hist. in J. White Jrnl. Voy. New S. Wales App. 283 Their
base is a triangle of the scalenus kind, or having one angle obtuse and
two acute.
1879 E. P. Wright Animal Life 6 This bone forms an obtuse angle with
the pelvis.
1972 M. Kline Math. Thought xii. 239 The negative values of the cosine
and tangent functions for obtuse angles.
1991 Choice Mar. 77/3 Most restaurants now have low chairs..with the
backs at an acute angle, compressing the stomach, whereas they should be
at right angles and preferably an obtuse angle.
(Hide quotations)
2. figurative.
Thesaurus »
Categories »
a. Annoyingly unperceptive or slow to understand; stupid; insensitive.
Also, of a remark, action, etc.: exhibiting dullness, stupidity or
insensitivity; clumsy, unsubtle. Formerly also: †rough, unpolished; =
blunt adj. 4 (obsolete rare).
1509 S. Hawes Pastime of Pleasure (1845) xiii. 113 I am but yonge, it
is to me obtuse Of these maters to presume to endyte.
a1586 Sir P. Sidney Lady of May in Arcadia (1598) sig. Bbb5v Thus must
I vniforme my speech to your obtuse conceptions.
1602 J. Marston Antonios Reuenge i. iii. sig. B2 I scorne to retort
the obtuse ieast of a foole.
1606 W. Warner Continuance Albions Eng. xvi. civ. 408 Obtuse in phrase.
1667 Milton Paradise Lost xi. 541 Thy Senses then Obtuse, all taste of
pleasure must forgoe.
1792 M. Wollstonecraft Vindic. Rights Woman iii. 107 If the faculties
are not sharpened by necessity, they must remain obtuse.
1829 Scott Anne of Geierstein I. ii. 41 Obtuse in his understanding,
but kind and faithful in his disposition.
1885 M. Blind Tarantella I. xi. 121 We were too obtuse to understand
their peculiar way of manifesting it.
1915 W. S. Maugham Of Human Bondage cxi. 589 He remembered with what a
callous selfishness his uncle had treated her, how obtuse he had been to
her humble, devoted love.
1952 H. E. Bates Love for Lydia ii. iii. 121 Perhaps the sisters were
not, after all, as obtuse as they sometimes seemed.
1992 Daily Tel. (BNC) 5 Apr. 13 Kohl..will have to live with a
politically obtuse gesture that is being compared to his appearance with
American President Ronald Reagan [etc.].
1999 SL (Cape Town) June 144 (advt.) I love being obtuse. Obtuse is
my middle name.
(Hide quotations)
†b. Not acutely affecting the senses; indistinctly felt or perceived;
dull. Obsolete.
1620 T. Venner Via Recta ii. 31 The wine..carrieth the same, which
otherwise is of an obtuse operation, vnto all the parts [of the body].
1733 Swift Epist. to Lady 12 Bastings heavy, dry, obtuse.
1781 W. Cowper Hope 22 Pleasure is labour too, and tires as much,..By
repetition palled, by age obtuse.
1791 Philos. Trans. 1790 (Royal Soc.) 80 426 I..felt an obtuse
pain..in my stomach.
1897 T. C. Allbutt et al. Syst. Med. IV. 126 Pain, sharp or obtuse.