Struggle against a pitiless fate.
非情 means heartless or unfeeling, often used for cold, impersonal decisions or systems, whereas 無慈悲 can carry a more dramatic or moral condemnation.
Compound of 無 (mu, 'without') and 慈悲 (jihi, 'mercy, compassion'). The word 慈悲 itself is a Buddhist term for benevolence and compassion, so 無慈悲 literally means 'without compassion'.