"not knowingly" is a correct phrase that can be used in written English. It usually expresses that the speaker/writer did not intend to do something, or did not realize they were doing something. For example, "I did not knowingly cause any harm to the environment.".
He did, according to the committee, though not knowingly.
He added: "She did not knowingly decide not to declare.
"I did not knowingly commit an illegal act.
"I did not knowingly, purposely lie," he says, and then pauses, considering, to add a word: "I did not knowingly, purposely, intentionally lie.
"We would not knowingly associate with the abuse of a disadvantaged group like the refugees.
Government officials insist that they did not knowingly imperil the public.
We do not knowingly carry any illegal items in our network.
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Claudia Letizia
Head Translator and Proofreader @ organictranslations.eu