instrenuus
From LSJ
in-strēnŭus: a, um, adj.,
I not brisk, inactive, sluggish, spiritless (poet. and in post-Aug. prose): homo, Plaut. Most. 1, 2, 23: animus, Ter. Heaut. 1, 1, 68: dux, Suet. Vesp. 4. — Adv.: instrēnŭē, without spirit: non instrenue moriens, Just. 17, 2, 1.