Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
in-dēfensus, a, um, adj., unprotected, undefended (perh. not ante-Aug.): Capua deserta indefensaque, Liv. 25, 15, 2: indefensi, inulti, id. 4, 28, 4: inauditus et indefensus, Tac. A. 2, 77: conjux, id. ib. 11, 34.
Adv.: indēfensē, without defence, Cod. Just. 4, 18, 2 fin.