Unmerciful : নির্মম; ক্ষমাহীন; অত্যধিক; নিষ্ঠুর; অকরুণ; নির্দয়; দয়াহীন;
Related Words
unmerciful  unmercifully  See Words Also In
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Appropriate Prepositions
Derive from (উৎসারিত হওয়া): The one has been derived from the poem.
Fail in (ব্যর্থ হওয়া): He failed in getting internet connection in his room.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
Object to (আপত্তি করা): He objected to my proposal.
Rule over (শাসন করা): In the absence of the Parliament, the President rules over the country.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
Lion’s share (বড় মাপের অংশ): He took the lion’s share of the profit.
Null and void (বাতিল): The deed has been null and void now.
Slow coach (অলস): You cannot expect much from a slow coach.
Without fail (অবশ্যই) - You must attend the meeting without fail.