What does "not even" mean?

Introduces or constitutes a more emphatic negation or exclusion than "not".

Not even

Common synonyms include: absolutely not, by no means, more odd, nonparity, not at all, not even remotely.

adv, intj, slang

adv, intj, slang ·Moderate ·College level

Adverb

1
Introduces or constitutes a more emphatic negation or exclusion than "not". not-comparable
"Not even I knew that."

Intj

1
Used to express strong disappointment or disapproval. colloquial
"I heard they wanted to cancel the show tonight. – Not even!"

"I heard they wanted to cancel the show tonight. – Not even!"