The difference between Hideous and Ugly

When used as adjectives, hideous means extremely or shockingly ugly, whereas ugly means displeasing to the eye.

Ugly is also noun with the meaning: ugliness.

Ugly is also verb with the meaning: to make ugly (sometimes with up).

check bellow for the other definitions of Hideous and Ugly

Hideous as an adjective:

Extremely or shockingly ugly.

Examples:

"A piteous and hideous spectacle."
Hideous as an adjective:

Having a very unpleasant or frightening sound
Hideous as an adjective:

Hateful; shocking.
Hideous as an adjective:

Morally offensive; shocking; detestable.

Ugly as an adjective:

Displeasing to the eye; not aesthetically pleasing.
Ugly as an adjective:

Displeasing to the ear or some other sense.
Ugly as an adjective:

Offensive to one's sensibilities or morality.

Examples:

"He played an ugly trick on us."
Ugly as an adjective:

Ill-natured; crossgrained; quarrelsome.

Examples:

"an ugly temper; to feel ugly'"
Ugly as an adjective:

Unpleasant; disagreeable; likely to cause trouble or loss.

Examples:

"an ugly rumour; an ugly customer; an ugly wound"

"With all this competition, expect things to get ugly."

Ugly as a noun (slang, uncountable):

Ugliness.
Ugly as a noun (slang):

An ugly person or thing.
Ugly as a noun (UK, informal, dated):

A shade for the face, projecting from a bonnet.

Examples:

"rfquotek Charles Kingsley"

Ugly as a verb (transitive, nonstandard):

To make ugly (sometimes with up).