The difference between Dull and Smart

When used as verbs, dull means to render dull, whereas smart means to hurt or sting.

When used as adjectives, dull means lacking the ability to cut easily, 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 Dull and Smart

Dull as an adjective:

Lacking the ability to cut easily; not sharp.

Examples:

"All these knives are dull."
Dull as an adjective:

Boring; not exciting or interesting.

Examples:

"He sat through the dull lecture and barely stayed awake."

"When does having a dull personality ever get you a girlfriend? Even if you get one, how does being dull help you keep a relationship for over a year?"
Dull as an adjective:

Not shiny; having a matte finish or no particular luster or brightness.

Examples:

"Choose a dull finish to hide fingerprints."

"a dull fire or lamp;&emsp; a dull red or yellow;&emsp; nowrap a dull mirror"
Dull as an adjective:

Not bright or intelligent; stupid; slow of understanding.
Dull as an adjective:

Sluggish, listless.
Dull as an adjective:

Cloudy, overcast.

Examples:

"It's a dull day."
Dull as an adjective:

Insensible; unfeeling.
Dull as an adjective:

Heavy; lifeless; inert.
Dull as an adjective (of pain etc):

Not intense; felt indistinctly or only slightly.

Examples:

"Pressing on the bruise produces a dull pain."
Dull as an adjective:

Not clear, muffled.

Dull as a verb (transitive):

To render dull; to remove or blunt an edge or something that was sharp.

Examples:

"Years of misuse have dulled the tools."
Dull as a verb (transitive):

To soften, moderate or blunt; to make dull, stupid, or sluggish; to stupefy.

Examples:

"He drinks to dull the pain."
Dull as a verb (intransitive):

To lose a sharp edge; to become dull.

Examples:

"A razor will dull with use."
Dull as a verb:

To render dim or obscure; to sully; to tarnish.

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.