IPA: /ˈhɛlɪʃli/
KK: /hɛlɪʃli/
In a way that is extremely unpleasant or difficult, often causing suffering or distress.
The weather was hellishly hot during our vacation, making it hard to enjoy outdoor activities.
Hellishly → It is formed from "hell" (from Old English *hell*, meaning the underworld or a place of torment) and the suffix "-ishly" (meaning in a manner of). The word "hellishly" means in a manner that is characteristic of hell, often implying something extremely unpleasant or intense.
Think of the word 'hell' as a place of torment, and remember that 'hellishly' describes something done in a very unpleasant or intense way.