Unclockable

Oddy also claims that any car you intend to buy almost certainly has a genuine mileage as complicated electronics make them famously unclockable.

Source: wiktionary

Sam McDowell had come over from the San Francisco Giants on the same day, and the left-hander with the host of personal problems and unclockable fastball was still on the roster, always a threat to live up to his immense talent.

Source: wiktionary

Sharon can take off at unclockable speeds and be racing down the highway before the guys have shifted into fourth.

Source: wiktionary

Thanks to the internet, the American language seems to be exploding at an almost unclockable pace.

Source: wiktionary