Definitions: (1) that which cannot be confused; (2) a bedrock reality

Derivation: Latin, “not shaken (violently)”

Quote: Truth is inconcussible—forever exempt from all transient vicissitudes, albeit never dead and formal, always vibrant and adaptable—radiantly alive. But when truth becomes linked with fact, then both time and space condition its meanings and correlate its values. (118:3.3) — The Urantia Book {1955}