ūsurpātīvus — Lewis & Short
ūsurpātīvus, a, um, adj.usurpo, II. B. 2.,
I wrongly used, unusual, improper, usurpative (late Lat.):
species verborum,Diom. p. 389 P.; Macr. Diff. Verb. p. 2764 ib. —Adv.: ūsurpātīvē, in an unusual manner, improperly, wrongly:
usurpative ait hordea,Serv. ad Verg. G. 1, 210; id. ad Verg. A. 7, 289.