1. in a manner that is extremely unpleasant, difficult, or severe; dreadfully
Usage: informal; intensifier

Examples

• The weather was hellishly hot during the summer.
• That exam was hellishly difficult.
• The traffic was hellishly bad this morning.
• She found the job hellishly stressful.
• It's hellishly expensive to live in that city.
• The pain was hellishly intense after the injury.