If you like etymology, just so you know : 비 is negative particle 일관 is noun for 'consistency' or 'coherence' 적 is possessive particle. Therefore literally it means 'of non-consistency'. For instance 비일관적인 생각 (a non-consistent thinking)

비일관적 means 'inconsistant'. It is often called 'inconsistent' when one person's opinion does not fit in front and back.