insipientia
From LSJ
ἐξ ὀνύχων λέοντα τεκμαίρεσθαι → judge by the claws, judge by a slight but characteristic mark, small traits give the clue to the character of a person, deduce something from a small indication, identify a lion from its claws
Latin > English (Lewis & Short)
insĭpĭentĭa: ae, f. insipiens,
I want of wisdom, senselessness, folly (class.): ita fit, ut sapientia sanitas sit animi, insipientia autem quasi insanitas quaedam, quae est insania eademque dementia, Cic. Tusc. 3, 5, 10; 3, 28, 68; Plaut. Am. prol. 36; id. Mil. 3, 3, 5; id. Poen. 5, 2, 130.