The difference between Obtuse and On the ball

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

Obtuse is also adjective with the meaning: .

On the ball is also phrase with the meaning: alert, active, or attentive.

check bellow for the other definitions of Obtuse and On the ball

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.