Obtuse \Ob*tuse"\ a. [Compar. Obtuser; superl. Obtusest.]

[L. obtusus, p. p. of obtundere to blunt: cf. F. obtus. See Obtund.]

1. Not pointed or acute; blunt; -- applied esp. to angles greater than a right angle, or containing more than ninety degrees. [1913 Webster]

2. Not having acute sensibility or perceptions; not alert, especially to the feelings of others; dull; stupid; as, obtuse senses. --Milton. [1913 Webster]

3. Dull; deadened; as, obtuse sound. --Johnson. [1913 Webster] Obtuse-angled

Source: The Collaborative International Dictionary of English v.0.48
 

118 Moby Thesaurus words for "obtuse": abrupt, affectless, anesthetized, arctic, asleep, autistic, benumbed, bluff, blunt, blunt-edged, blunt-ended, blunt-pointed, blunt-witted, blunted, bluntish, boneheaded, callous, catatonic, chill, chilly, cloddish, cold, cold as charity, cold-blooded, coldhearted, cool, dead, deadened, dense, dim, dim-witted, dispassionate, doltish, dopey, drugged, dull, dull of mind, dull-edged, dull-headed, dull-pated, dull-pointed, dull-witted, dulled, dullish, edgeless, emotionally dead, emotionless, faired, fat-witted, frigid, frosted, frosty, frozen, gross-headed, heartless, heavy, hebetudinous, icy, immovable, impassible, impassive, imperceptive, impercipient, inexcitable, insensate, insensible, insensitive, insentient, insusceptible, loutish, lumpish, mentally retarded, nonemotional, numb, numbed, oafish, obdurate, objective, out of touch, passionless, pointless, rounded, self-absorbed, simple, slow, slow-witted, sluggish, smoothed, soulless, spiritless, stolid, thick, thick-brained, thick-headed, thick-pated, thick-skinned, thick-witted, thickheaded, thickskulled, unaffectionate, unedged, unemotional, unfeeling, unfelt, unimpassioned, unimpressionable, unloving, unpassionate, unperceptive, unpointed, unresponding, unresponsive, unsharp, unsharpened, unsusceptible, unsympathetic, untouchable, wooden

Source: Moby Thesaurus II by Grady Ward, 1.0
 

obtuse adj
1: of an angle; between 90 and 180 degrees [ant: acute]
2: of a leaf shape; rounded at the apex
3: 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 [syn: purblind]
4: 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" [syn: dense, dim, dull, dumb, slow]

Source: WordNet (r) 2.0
 

Obtuse \Ob*tuse"\ a. [Compar. Obtuser; superl. Obtusest.]

[L. obtusus, p. p. of obtundere to blunt: cf. F. obtus. See Obtund.]

1. Not pointed or acute; blunt; -- applied esp. to angles greater than a right angle, or containing more than ninety degrees.

2. Not having acute sensibility or perceptions; dull; stupid; as, obtuse senses. --Milton.

3. Dull; deadened; as, obtuse sound. --Johnson.

Source: Webster's Revised Unabridged Dictionary (1913)