Unfaithful : অবিশ্বস্ত, বিশ্বাসঘাতক;
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unfaithful  unfaithfully  unfaithfulness  See Words Also In
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Appropriate Prepositions
Appoint to(নিযুক্ত করা/হওয়া): Kibria has been appointed to the post of Headmaster.
Attacked with(আক্রান্ত): He is attacked with …
Die from (কোন কিছু জন্য মারা যাওয়া): The poor person died from hunger.
Meet with (হঠাৎ কোন কিছু হওয়া): Yesterday I met with an accident.
Play at (খেলা): I do not play at cards.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Bear in mind (remember— মনে রাখা —V): You should also bear in mind the additional costs of the mortgage.
Call in question (সন্দেহ করা): No one can call his honesty in question.
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
On the whole (মোটের ওপর): On the whole, his conduct is good.