unreliable

Practice sessions are notoriously unreliable indicators of form because fuel loads and car specifications are not revealed by the teams and can have a significant impact on lap time.

Bertie is both a classic unreliable narrator and a stock comic character given life.

GPs have told the BBC that unreliable blood results, with erroneously high levels of potassium caused by processing delays, are a regular occurrence since Synnovis began the service.

A Scottish based company that offers tours of Northern Ireland said while they promote the Gobbins on their website, they haven't included it on tours due to its "unreliable" opening.

Stuck in a vicious cycle of innocence lost, regained, then lost again, American history reveals itself to be a series of stories told by individuals dependent on inconsistent and unreliable sources.