nĕc-ŏpīnans — Lewis & Short
nĕc-ŏpīnans (also separately, nĕc ŏpīnans), antis,
et necopinanti (tibi) mors ad caput accidit,Lucr. 3, 959 (Lachm., nec opinanti):
Ariobarzanem necopinantem liberavi,Cic. Fam. 15, 4, 10; Phaedr. 5, 7, 8.—Hence, adv.: nĕcŏpīnanter, unexpectedly, unawares: necopinanter, a)prosdokh/tws, Gloss. Philox.