nonstandard

The models were unable to read the characters within the tags on the electric poles 90% of the time because it didn’t identify the nonstandard font and varying background colors used in the tags.

Alternatively, the cancer could have spread during the nine months that Jobs was experimenting with nonstandard therapies.

Where the hell did my subway pass get off on finking me out for having a "nonstandard ride pattern?"

Oh, you mean riding public transit in a nonstandard way isn't a crime?

Several instances of possibly nonstandard spelling have been noted with ‘sic’, which have been retained.