일관성이 · 일관성을
consistency, coherence
Example
부모는 아이에게 일관성 있는 태도를 보여야 해요.
Parents should show a consistent attitude toward their children.
Word parts
일 one+관 pierce+성 quality
Literally 'pierced through as one': staying the same from start to finish.
Good to know
Pronounced [일관썽]; 일관성 있다/없다 works like an adjective.