Unthankful : অকৃতজ্ঞ;
Related Words
unthankful  unthankfulness  unthinkable  See Words Also In
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Anxious for (কারোর ব্যাপারে চিন্তিত): Sabbir was anxious for her.
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Attacked by(আক্রান্ত ব্যক্তিবাচক): He has been attacked by a gang of robbers.
Match for (প্রতিদ্বন্দ্বী): He is no match for me.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
Beggar description - (অবর্ণনীয় হওয়া): The distress of the Muslims in Bosnia beggars description.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Swan-song (অন্তিম গীত, শেষ কর্ম): This writing is the swan song of Kazi Nazrul islam.