Unfaithful : অবিশ্বস্ত, বিশ্বাসঘাতক;
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unfaithful  unfaithfully  unfaithfulness  See Words Also In
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Appropriate Prepositions
Argue with, about(কথা কাটাকাটি করা): They always argue with me about tiny matter.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Look after (দেখাশুনা): He looks after me.
Look for (খোঁজা): I was looking for the lost phone.
Work for (কারো জন্য কাজ করা): She works for a construction company.
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Idioms
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.
Steer clear of (avoid, দূরে থাকা)— You must steer clear of evil company.
Set something right (ঠিক করা)— He will set the machine right.
Through thick and thin (through all difficulties, সমস্ত সমস্যার মধ্যে)-Ruma followed her husband through thick and thin.
Weal and woe (joy and sorrow, সুখ দঃখ) —Human life is full of weal and woe.