The difference between Ignorant and Smart

When used as nouns, ignorant means one who is ignorant, whereas smart means a sharp, quick, lively pain.

When used as adjectives, ignorant means unknowledgeable or uneducated, whereas smart means exhibiting social ability or cleverness.

Smart is also verb with the meaning: to hurt or sting.

check bellow for the other definitions of Ignorant and Smart

Ignorant as an adjective:

Unknowledgeable or uneducated; characterized by ignorance.
Ignorant as an adjective:

Not knowing (a fact or facts), unaware (of something).
Ignorant as an adjective (slang):

Ill-mannered, crude.

Examples:

"His manner was at best off-hand, at worst totally ignorant."
Ignorant as an adjective (obsolete):

unknown; undiscovered
Ignorant as an adjective:

Resulting from ignorance; foolish; silly.

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.