The difference between Obtuse and Smart

When used as verbs, obtuse means to dull or reduce an emotion or a physical state, whereas smart means to hurt or sting.

When used as adjectives, obtuse means , whereas smart means exhibiting social ability or cleverness.

Smart is also noun with the meaning: a sharp, quick, lively pain.

check bellow for the other definitions of Obtuse and Smart

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.

Smart as a verb (intransitive):

To hurt or sting.

Examples:

"After being hit with a pitch, the batter exclaimed "Ouch, my arm smarts!"
Smart as a verb (transitive):

To cause a smart or sting in.
Smart as a verb (intransitive):

To feel a pungent pain of mind; to feel sharp pain or grief; to suffer; to feel the sting of evil.

Smart as an adjective:

Exhibiting social ability or cleverness.
Smart as an adjective (informal):

Exhibiting intellectual knowledge, such as that found in books.
Smart as an adjective (often, in combination):

Equipped with digital/computer technology.

Examples:

"smart bomb'', ''smart car"

"smartcard'', ''smartphone"
Smart as an adjective:

Good-looking.

Examples:

"a smart outfit"
Smart as an adjective:

Cleverly shrewd and humorous in a way that may be rude and disrespectful.

Examples:

"He became tired of his daughter's sarcasm and smart remarks''."

"Don't get smart with me!"
Smart as an adjective:

Sudden and intense.
Smart as an adjective:

Causing sharp pain; stinging.
Smart as an adjective:

Sharp; keen; poignant.

Examples:

"a smart pain"
Smart as an adjective (US, Southern, dated):

Intense in feeling; painful. Used usually with the adverb intensifier right.

Examples:

"He raised his voice, and it hurt her feelings right smart."

"That cast on his leg chaffs him right smart."
Smart as an adjective (archaic):

Efficient; vigorous; brilliant.
Smart as an adjective (archaic):

Pretentious; showy; spruce.

Examples:

"a smart gown"
Smart as an adjective (archaic):

Brisk; fresh.

Examples:

"a smart breeze"

Smart as a noun:

A sharp, quick, lively pain; a sting.
Smart as a noun:

Mental pain or suffering; grief; affliction.
Smart as a noun:

Smart-money.
Smart as a noun (slang, dated):

A dandy; one who is smart in dress; one who is brisk, vivacious, or clever.