Obtund Or Obtuse

• lacking in liveliness or animation

• emitting or reflecting very little light

• not keenly felt

• not having a sharp edge or point

• being or made softer or less loud or clear

• so lacking in interest as to cause mental weariness

• (of color) very low in saturation; highly diluted

• slow to learn or understand; lacking intellectual acuity

• (of business) not active or brisk

• blunted in responsiveness or sensibility

• not clear and resonant; sounding as if striking with or against something relatively soft

• darkened with overcast

• make dull in appearance

• become dull or lusterless in appearance; lose shine or brightness

• deaden (a sound or noise), especially by wrapping

• make numb or insensitive

• make dull or blunt

• become less interesting or attractive

• make less lively or vigorous

• having a broad or rounded end

• used of a knife or other blade; not sharp

• characterized by directness in manner or speech; without subtlety or evasion

• devoid of any qualifications or disguise or adornment

• make less intense

• make numb or insensitive

• make dull or blunt

• make less sharp

• make less lively, intense, or vigorous; impair in vigor, force, activity, or sensation

• the inverse function of the cosine; the angle that has a cosine equal to a given number