Unfalteringly : অবিচলিতচিত্তে; দ্বিধাহীনভাবে; নির্দ্বিধরূপে;
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Appropriate Prepositions
Apathy towards (অনাগ্রহ): The student has great apathy towards his studies.
Conform to (নিয়মনীতি অনুসরণ করা): The employees have to conform to a strict dress code.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
Greed for (লোভ): He has an indomitable greed for wealth.
Match for (প্রতিদ্বন্দ্বী): He is no match for me.
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Idioms
All in - (পরিশ্রান্ত): I was all in after the meeting.
Fish out of water (অস্বস্তিকর অবস্থা): When he came to the village, he felt like fish out of water.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.
Soft Soap (নিজ অভিপ্রায়ে/অভিসন্ধিতে তোষামোদ করা): He was expert in soft soap.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.