Based on the level of respect or formality, you can say "That is a little rough" in Korean in 3 ways:

• Informal: geu-geon jom geochil-eo (그건 좀 거칠어)
• Formal: geu-geon jom geochil-eoyo (그런 좀 거칠어요)
• Very Formal: geu-geon jom geochipnida ()

- that: geu-geon (그건), geu-geot-eun (그것은)
- little: yakgan (약간)
- rough: geochilda (거칠다), geochileun (거칠은)

Please refer to How to pronounce Korean Alphabet for the English pronunciation in this answer.