non liquet
/nɒnˈlɪkwɛt/noun
Chiefly Law. A verdict of non liquet, given in cases of doubt. Also (in extended use): a condition of doubt or uncertainty.
noun
Chiefly Law. ‘It is not clear’; given as a verdict in cases of doubt, as where the evidence or the law is insufficiently clear.
Origin
Early 17th century; earliest use found in Francis Bacon (1561–1626), lord chancellor, politician, and philosopher. From classical Latin nōn liquet it is not clear (as a verdict) from nōn not + liquet it is clear, impersonal present indicative of liquēre to be liquid, clear.