1. нареч. by no means, not at all, in no way, nowise он никак не мог узнать ее адрес – in no way could he discover her address
2. вводн.
разг. (кажется) it seems, it would appear они,никак, уже пришли – they are here already, it seems
ad. in no way, он - не мог понять he simply couldn't comprehend