AskDefine | Define obtuse

Dictionary Definition

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]

User Contributed Dictionary




  1. Intellectually dull or dim-witted.
  2. Indirect or circuitous.
  3. Of sound: deadened or muffled.
  4. Blunt; not sharp.
  5. Of an angle: greater than 90 degrees but less than 180 degrees.
  6. Of a triangle: with one obtuse angle.




intellectually dull
of a sound
of an angle
of a triangle See obtuse-angled



  1. Form of feminine, obtus

Extensive Definition

Obtuse may refer to:
  • Obtuse angle, an angle of between 90 and 180 degrees
  • Obtuse triangle, a triangle with an internal angle of between 90 and 180 degrees
  • leaf shape
  • Lacking sharpness or quickness of sensibility

Synonyms, Antonyms and Related Words

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
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