Late Middle English; earliest use found in Geoffrey Chaucer (c1340–1400), poet and administrator. From non- + certain, after Anglo-Norman nun certein, noun certayne.
Definition of non-certain in US English:
non-certain
adjectivenɒnˈsəːtn
Uncertain.
Origin
Late Middle English; earliest use found in Geoffrey Chaucer (c1340–1400), poet and administrator. From non- + certain, after Anglo-Norman nun certein, noun certayne.