punishingly
/ˈpʌnɪʃɪŋli/
adverb
- In a way that is extremely difficult, tiring, or demanding; to a degree that causes great hardship or suffering.
- She worked punishingly long hours to meet the deadline.
- The desert heat was punishingly intense, even for the locals.
- The hike was punishingly steep, leaving everyone breathless.