"not deviate" is a correct and usable phrase in written English.
It means to not stray, diverge, or deviate from something. Example: The instructions were clear and specific, so be sure not to deviate from them.
His tastes do not deviate from everyone else's tastes.
"But, God, let us fight for peace; let us not deviate from establishing peace.
The firm has said that it did not deviate from standard Wall Street practice.
Wen could not deviate from that, even if he had been minded to do so.
Hollande said that he would not deviate from commitments to "ensure the security of our country".
He warned Tony Blair that the Saville findings should not deviate a millimetre from Widgery's.
My mom always laid down the laws, and you did not deviate.
However, economical design should not deviate from engineering restrictions and laws.
If we agree to stick to a collective agreed position, we should not deviate from that.
The game itself will not deviate much from the model offered by Major League Baseball.
"We have not and will not deviate from those principles.
