Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
infensē, adv., v. infensus fin.
infensus, a, um, adj. [2. in-fendo], hostile, inimical, enraged (class.; cf. infestus): infenso atque inimico animo venire, Cic. Verr. 2, 2, 61, § 149.
With dat.: Drances infensus Turno, Verg. A. 11, 122: opes principibus infensae, dangerous, Tac. A. 11, 1.
With in and acc.: infensioribus in se quam in illum judicibus, Liv. 39, 6, 5: infensius servitium, hard, oppressive, Tac. A. 1, 81: valetudo, illness, sickness, id. ib. 14, 56; 4, 48; Suet. Vit. 14; Vop. Aur. 36.
Sup.: infensissima virtus, Aug. cont. Jul. Pelag. 6, § 34.
Hence, adv.: infensē, hostilely, bitterly (class.): quis Isocrati est adversatus infensius? Cic. Or. 51, 172: infense invectus, Tac. A. 5, 3.