How to Use "unmerciful" with Example Sentences

1. His mother and himself were cruel and unmerciful .
2. One day , however , it is trampled by the unmerciful warfare .
3. R : unmerciful mire , lick up the most lovely person in the world !
4. Including the unmercifulness into mercifulness and tying unmerciful system in merciful management so as to gain a better management effect is the management realm expected while emotion management is carried on .
5. His selfish unmerciful attitude never change .