Webster's Revised Unabridged Dictionary · 1913

Incommunicable

Incommunicable , adjective

[Latin incommunicabilis: compare French incommunicable. See In- not, and Communicable.]

Not communicable; incapable of being communicated, shared, told, or imparted, to others.
Health and understanding are incommunicable. — Southey
Those incommunicable relations of the divine love. — South