(dated, now rare) Not nutritious. / (by extension, of a speech or an argument) Lacking matter; empty; devoid of substance. / Naive; simplistic.

In a jejune manner.

The state or condition of being jejune.

Jejuneness.

plural of jejunity

(anatomy) Of or pertaining to the jejunum

(pathology) inflammation of the jejunum

(surgery) Removal (of all, or part) of the jejunum

plural of jejunectomy

(rare) jejuneness