to be unkind or without compassion
निष्ठुर या सहानुभूति के बिना होना (nishthur ya sahanubhuti ke bina hona)
"She must have a heart of stone to ignore that crying child."
"उसे उस रोते हुए बच्चे को नज़रअंदाज़ करने के लिए एक पत्थर दिल होना चाहिए।" (Use us rote huye bachche ko nazarandaz karne ke liye ek **patthar dil** hona chahiye.)
to feel tired or exhausted due to overwork or illness
a part of the complete solution or understanding
to have a burst of energy after feeling tired
to make something easier to understand or to tidy a place
to decide something different from before
to become angry or upset