The difference between Horribly and Terribly

When used as adverbs, horribly means in a horrible way, whereas terribly means so as to cause terror or awe.

check bellow for the other definitions of Horribly and Terribly

Horribly as an adverb (manner):

In a horrible way; very badly.

Examples:

"The beginning art students displayed their horribly executed paintings with hopeful faces."
Horribly as an adverb (degree, often modifying a negative adverb or adjective):

To an extreme degree or extent.

Examples:

"Then everything went horribly wrong."

"The man was horribly nice, yet she still wouldn't marry him."
Horribly as an adverb (evaluative):

With a very bad effect.

Examples:

"Horribly, as he was dying, his eyes reddened."

Terribly as an adverb (literary, _, or, _, dated):

So as to cause terror or awe.

Examples:

"The lion roared terribly."
Terribly as an adverb:

Very; extremely.

Examples:

"He's terribly busy and you really shouldn't bother him."
Terribly as an adverb:

Very badly.

Examples:

"She took part in the karaoke, but sang terribly."