Definition of not know someone from Adam in English:

not know someone from Adam

Not know or be completely unable to recognize the person in question: I wouldn’t know my stepbrother from Adam
More example sentences
  • There's nothing more transparent than a politician smiling and greeting you like a long lost friend when you know well he doesn't know you from Adam.
  • If you bank in the high street the person behind the counter doesn't know you from Adam.
  • And despite the fact that he doesn't know me from Adam, he is prepared to trust me with all that money.
See parent entry: Adam

Definition of not know someone from Adam in:

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Word of the day flippant
Pronunciation: ˈflɪp(ə)nt
adjective
not showing a serious or respectful attitude