Nondeducible

Part of speech: adjective

Definitions

1. Not capable of being logically inferred or derived from given information
2. Unable to be deduced or reasoned from facts or premises presented
3. Describes something that cannot be arrived at through logical deduction or analysis

Etymology: "Nondeducible" is a plain formation: the prefix "non-" attached to "deducible," meaning able to be deduced. "Deducible" itself comes from "deduce," which traces back through Middle English and Old French to Latin "deducere," meaning "to lead down" or "to lead away," from "de-" (down or away) and "ducere" (to lead). A deduction, in that original sense, is a conclusion led down from premises, one step at a time. So the word describes something that cannot be reached by that step-by-step leading. A fact that no chain of reasoning from the available premises can deliver is nondeducible, even if it is true. The term is a straightforward English construction, built from existing parts rather than borrowed whole.