Unfaithful : অবিশ্বস্ত, বিশ্বাসঘাতক;
Related Words
unfaithful  unfaithfully  unfaithfulness  See Words Also In
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Appropriate Prepositions
Argue against (বিপক্ষে বলা): She argued against the bill.
Indulge in (প্রশ্রয় দেওয়া): You should not indulge in idleness.
Remedy for (প্রতিকার): There is no remedy for his misbehavior.
Repent on (নির্ভরশীল): He is repent on his parents.
Remedy for (প্রতিকার): There is no remedy for cancer.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.
Give in (বশ্যতা স্বীকার করা): We will never give in to our enemies.
In no time (শীঘ্র): He will finish the work in no time.
On the whole (মোটের ওপর): On the whole, his conduct is good.