The difference between Apologetic and Sorry

When used as adjectives, apologetic means having the character of apology, whereas sorry means regretful for an action.

Sorry is also interjection with the meaning: expresses regret, remorse, or sorrow.

Sorry is also noun with the meaning: the act of saying sorry.

check bellow for the other definitions of Apologetic and Sorry

Apologetic as an adjective:

Having the character of apology; regretfully excusing

Examples:

"His tone was apologetic as he explained what had happened."
Apologetic as an adjective (dated):

Defending by words or arguments; said or written in defense.

Sorry as an adjective (of a person):

Regretful for an action; grieved or saddened, especially by the loss of something or someone.

Examples:

"I am sorry I stepped on your toes. It was an accident."

"I am sorry to hear of your uncle's death."
Sorry as an adjective:

Poor, sad or regrettable.

Examples:

"The storm left his garden in a sorry state."
Sorry as an adjective:

Pathetic and inferior to the point of causing others disgust.

Examples:

"Bob is a sorry excuse for a football player."