What is the meaning of Không?

zero

river

Negates the meaning of the stated verb or adjective: not

not (to no degree)

idly; without doing anything else

not have; to lack

only, without anything else

air; space; nothing

no

yes

Used to form polar questions, placed at the end of a question

Used as an answer of refutation to a polar question: no

zero

Source: wiktionary.org