Hellish/ˈhelɪʃ/ Definition 1 of 3Pro Tip 1/3Negative Intensity Used to describe something extremely bad or difficult, emphasizing the negative aspect. She described her exam preparation as hellish. Pro Tip 2/3Emotional Stress Communicates a strong feeling of frustration or distress associated with an experience. The actor recounted his hellish journey to stardom. Pro Tip 3/3Informal Speech Common in casual conversation rather than formal or professional dialogue. Our road trip turned hellish when the car broke down.