hellish /ˈhɛlɪʃ/ adjective2 •infernal, related or similar to hell.Faustus is gone, regard his hellish fall, / Whose fiendful fortune may exhort the wise, / Onely to wonder at vnlawful things, […] — 1589 •causing great pain, discomfort or distress.I woke up from a hellish noise coming from the house next door. formsmore hellish · most hellish