Synonyms of the word

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.

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.

inarticulate

• adj. (of speech) not articulated in normal words.
• adj. speechless.
• adj. unable to speak with any clarity.
• adj. (biology) not having joints or other articulations.
• n. (zoology) An animal belonging to the subphylum Inarticulata.

mute

• adj. Not having the power of speech; dumb.
• adj. Silent; not making a sound.
• adj. Not uttered; unpronounced; silent; also, produced by complete closure of the mouth organs which interrupt…
• adj. Not giving a ringing sound when struck; said of a metal.
• n. (phonetics, now historical) A stopped consonant; a stop.
• n. (obsolete, theater) An actor who does not speak; a mime performer.
• n. A person who does not have the power of speech.
• n. A hired mourner at a funeral; an undertaker's assistant.
• n. (music) An object for dulling the sound of an instrument, especially a brass instrument, or damper for…
• v. (transitive) To silence, to make quiet.
• v. (transitive) To turn off the sound of.
• v. (now rare) Of a bird: to defecate.
• n. The faeces of a hawk or falcon.
• v. (transitive) To cast off; to moult.

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.

silent

• adj. Free from sound or noise; absolutely still; perfectly quiet.
• adj. Not speaking; indisposed to talk; speechless; mute; taciturn; not loquacious; not talkative.
• adj. Keeping at rest; inactive; calm; undisturbed.
• adj. (pronunciation) Not pronounced; having no sound; quiescent.
• adj. Having no effect; not operating; inefficient.
• adj. (technology) Without audio capability.
• adj. Hidden, unseen.
• adj. Of an edit or change to a text, not explicitly acknowledged.
• adj. Not implying significant modifications which would affect a peptide sequence.
• adj. Undiagnosed or undetected because of an absence of symptoms.
• n. (uncountable) That which is silent; a time of silence.
• n. A silent movie.

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.

speechless

• adj. not speaking; not knowing what to say; silent, especially due to surprise, amazement, etc.

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.