diabolical

As adjectives the difference between diabolical and dark

is that diabolical is extremely wicked or cruel while dark is having an absolute or (more often) relative lack of light.

As a noun dark is

a complete or (more often) partial absence of light.

Diabolical is a synonym of impious.

As adjectives the difference between diabolical and impious

is that diabolical is extremely wicked or cruel while impious is not pious.

Barbaric is a related term of diabolical.

As adjectives the difference between barbaric and diabolical

is that barbaric is of or relating to a barbarian; uncivilised, uncultured or uncouth while diabolical is extremely wicked or cruel.

Odious is a related term of diabolical.

As adjectives the difference between odious and diabolical

is that odious is arousing or meriting strong dislike, aversion, or intense displeasure while diabolical is extremely wicked or cruel.

Grievous is a related term of diabolical.

As adjectives the difference between grievous and diabolical

is that grievous is causing grief, pain or sorrow while diabolical is extremely wicked or cruel.

Bad is a related term of diabolical.

As a verb bad

is to simulate.

As an adjective diabolical is

extremely wicked or cruel.

Diabolical is a related term of shocking.

As adjectives the difference between diabolical and shocking

is that diabolical is extremely wicked or cruel while shocking is inspiring shock; startling.

As a verb shocking is

.

As a noun shocking is

the application of an electric shock.

Horrible is a related term of diabolical.

As adjectives the difference between horrible and diabolical

is that horrible is causing horror; terrible; shocking while diabolical is extremely wicked or cruel.

As a noun horrible

is a thing that causes horror; a terrifying thing, particularly a prospective bad consequence asserted as likely to result from an act.

Hellish is a synonym of diabolical.

As adjectives the difference between diabolical and hellish

is that diabolical is extremely wicked or cruel while hellish is causing pain, discomfort or distress.

As adjectives the difference between monstrous and diabolical

is that monstrous is hideous or frightful while diabolical is extremely wicked or cruel.