Definify.com

Webster 1913 Edition

Adj.

Of or pertaining to hell; like hell; infernal; malignant; wicked; detestable; diabolical.

“Hellish hate.”

Milton.

–

Hell′ish-ly

adv.

–

Hell′ish-ness

Noun.

Adj.

Pertaining to hell.

Like hell in qualities; infernal; malignant; wicked; detestable.

hellish ‎(comparative more hellish, superlative most hellish)

Causing pain, discomfort or distress.
I woke up from a hellish noise coming from the house next door.

causing pain, discomfort or distress