Synonyms of the word

obtuse

• adj. (now chiefly botany, zoology) Blunt; not sharp.
• adj. Intellectually dull or dim-witted.
• adj. Indirect or circuitous.
• adj. Of sound: deadened or muffled.
• adj. (geometry) Of an angle: greater than 90 degrees but less than 180 degrees.
• adj. (geometry) Of a triangle: with one obtuse angle.

dense

• adj. Having relatively high density.
• adj. Compact; crowded together.
• adj. Thick; difficult to penetrate.
• adj. Opaque; allowing little light to pass through.
• adj. Obscure, or difficult to understand.
• adj. (mathematics, topology) Being a subset of a topological space that approximates the space well. See Wikipedia…
• adj. (of a person) Slow to comprehend; of low intelligence.

dim

• adj. Not bright or colorful.
• adj. (colloquial) Not smart or intelligent.
• adj. Indistinct, hazy or unclear.
• adj. Disapproving, unfavorable: rarely used outside the phrase take a dim view of.
• adv. Dimly, indistinctly.
• n. (archaic) Dimness.
• v. (transitive) To make something less bright.
• v. (intransitive) To become darker.
• v. To render dim, obscure, or dark; to make less bright or distinct; to take away the luster of; to darken;…
• v. To deprive of distinct vision; to hinder from seeing clearly, either by dazzling or clouding the eyes;…

dull

• adj. Lacking the ability to cut easily; not sharp.
• adj. Boring; not exciting or interesting.
• adj. Not shiny; having a matte finish or no particular luster or brightness.
• adj. Not bright or intelligent; stupid; slow of understanding.
• adj. Sluggish, listless.
• adj. Cloudy, overcast.
• adj. Insensible; unfeeling.
• adj. Heavy; lifeless; inert.
• adj. (of pain etc) Not intense; felt indistinctly or only slightly.
• adj. (of a noise or sound) Not clear, muffled.
• v. (transitive) To render dull; to remove or blunt an edge or something that was sharp.
• v. (transitive) To soften, moderate or blunt; to make dull, stupid, or sluggish; to stupefy.
• v. (intransitive) To lose a sharp edge; to become dull.
• v. To render dim or obscure; to sully; to tarnish.

dumb

• adj. (dated) Unable to speak; lacking power of speech (kept in "deaf, dumb, and blind").
• adj. (dated) Silent; unaccompanied by words.
• adj. (informal, pejorative, especially of a person) extremely stupid.
• adj. (figuratively) Pointless, foolish, lacking intellectual content or value.
• adj. Lacking brightness or clearness, as a colour.
• v. (dated) To silence.
• v. (transitive) To make stupid.
• v. (transitive) To represent as stupid.
• v. (transitive) To reduce the intellectual demands of.

purblind

• adj. Partially blind.
• adj. Near-sighted or dim-sighted.
• adj. Lacking in discernment or understanding.

simple

• adj. Uncomplicated; taken by itself, with nothing added.
• adj. Without ornamentation; plain.
• adj. Free from duplicity; guileless, innocent, straightforward.
• adj. Undistinguished in social condition; of no special rank.
• adj. (now rare) Trivial; insignificant.
• adj. (now colloquial) Feeble-minded; foolish.
• adj. (heading, technical) Structurally uncomplicated.
• adj. (obsolete) Mere; not other than; being only.
• n. (medicine) A preparation made from one plant, as opposed to something made from more than one plant.
• n. (obsolete) A term for a physician, derived from the medicinal term above.
• n. (logic) A simple or atomic proposition.
• n. (obsolete) Something not mixed or compounded.
• n. (weaving) A drawloom.
• n. (weaving) Part of the apparatus for raising the heddles of a drawloom.
• n. (Roman Catholicism) A feast which is not a double or a semidouble.
• v. (transitive, intransitive, archaic) To gather simples, i.e., medicinal herbs.

slow

• adj. Taking a long time to move or go a short distance, or to perform an action; not quick in motion; proceeding…
• adj. Not happening in a short time; spread over a comparatively long time.
• adj. Of reduced intellectual capacity; not quick to comprehend.
• adj. Not hasty; not precipitate; lacking in promptness; acting with deliberation.
• adj. (of a clock or the like) Behind in time; indicating a time earlier than the true time.
• adj. Lacking spirit; deficient in liveliness or briskness.
• adj. (of a period of time) Not busy; lacking activity.
• v. (transitive) To make (something) run, move, etc. less quickly; to reduce the speed of.
• v. (transitive) To keep from going quickly; to hinder the progress of.
• v. (intransitive) To become slow; to slacken in speed; to decelerate.
• n. Someone who is slow; a sluggard.
• n. (music) A slow song.
• adv. Slowly.

stupid

• adj. Lacking in intelligence or exhibiting the quality of having been done by someone lacking in intelligence.
• adj. To the point of stupor.
• adj. (archaic) Characterized by or in a state of stupor; paralysed.
• adj. (archaic) Lacking sensation; inanimate; destitute of consciousness; insensate.
• adj. (slang) Amazing.
• adj. (slang) damn, annoying, darn.
• adv. (slang, dated) Extremely.
• n. A stupid person; a fool.
• n. (colloquial, uncountable) The state or condition of being stupid.

undiscerning

• adj. Not discerning.