Wiktionary
not even
adv. (non-gloss definition: Introduces or constitutes a more emphatic negation or exclusion than not.) interj. (context colloquial English) Used to express strong disappointment or disapproval.
Usage examples of "not even".
Most of them were not firing back, and not even Garvin could tell where they were.
By the time they reined up in front of her house, she knew a great deal about him, and not even his screaming muscles and aching knees were enough to kill his odd feeling of relaxation.
I'm not even positive which guests were involved and which day visitors.
I felt a bolt of horror go through me such as I had never experienced before or since, not even when they brought me the telegram with the news of Rosalie's death.