The difference between Obtuse and Quick off the mark

When used as adjectives, obtuse means , whereas quick off the mark means fast to act or react.

Obtuse is also verb with the meaning: to dull or reduce an emotion or a physical state.

check bellow for the other definitions of Obtuse and Quick off the mark

Obtuse as an adjective (now, chiefly, botany, zoology):

; not sharp, pointed, or acute in form. Blunt, or rounded at the extremity. One that is larger than one and smaller than two right angles, or more than 90 and less than 180. , having an obtuse angle.
Obtuse as an adjective:

Intellectually dull or dim-witted.
Obtuse as an adjective:

Of sound, etc.: deadened, muffled, muted.
Obtuse as an adjective:

Indirect or circuitous.

Obtuse as a verb (transitive, obsolete):

To dull or reduce an emotion or a physical state.

Quick off the mark as an adjective (idiomatic):

fast to act or react.