noun, na-adjective, noun which may take the genitive case particle 'no'
non-separability; indivisibility
Abstract noun/adjectival noun meaning something cannot be separated or divided. Stronger nuance than 不可分 (ふかぶん).
These two issues are in an indivisible relationship.
It must be treated as a non-separable element.
Compound of 非 (ひ, 'non-') and 可分 (かぶん, 'divisible'). The exact origin is uncertain, but it follows a standard Sino-Japanese word-formation pattern.