This is why eyewitness testimony is notoriously unreliable. This service was notoriously uncomfortable, unreliable and overcrowded. Official data is often unreliable and even self-contradictory. Thus, formula 3 is a sharp threshold between perfectly reliable and completely unreliable communication. These designs tended to be costly to make and were often unreliable and dangerous. This reduces efficiency, shortens plant life and makes operations unreliable and unsafe. Unreliable, as it produces false positives. He found that no newspaper would print the story on largely uncorroborated and unreliable evidence. Production was reportedly often delayed by his unreliable behavior. The vehicle proved to be very noisy and unreliable under combat conditions. Rainfall is unreliable, light and infrequent throughout summer. Perkin Warbeck's personal history is fraught with many unreliable and varying statements. This leads to complex and potentially unreliable mechanics. Her parents were hesitant as he was known to be unreliable and impetuous. Ford Mustang, which is more contemporary in appearance, but still unreliable and prone to breakdowns.