Unwarrantable : অনুচিত; অসমর্থনীয়;
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Appropriate Prepositions
Afraid of(ভীত): An honest man is not afraid of telling the truth.
Control over(নিয়ন্ত্রণ): He has no control over his sons.
Desist from (বিরত থাকা): She desisted from making this.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Rely on (নির্ভর করা): We should not rely on a lazy man.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
Silver tongue (মিষ্টভাষী)- He is a man of silver tongue.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.