Schrödinger's lie
noun phrase
A claim that is technically false but is consistent with all available evidence.
When Leon texted me to ask if I’d remembered to pick up bread at the grocery store, I replied that I had, and then swung by the store to pick up the bread before I came home. Yeah, it was a lie, but it was a Schrödinger’s lie - as far as Leon will ever know, it was true.