Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. fīdentĭa, ae, f. [fidens, from fido], confidence, self-confidence, boldness (a philosophical word of Cicero): ejus (fortitudinis) partes sunt magnificentia, fidentia, patientia, perseverantia … fidentia est, per quam magnis et honestis in rebus multum ipse animus in se fiduciae certa cum spe collocavit, Cic. Inv. 2, 54, 163: fidentiae contrarium est diffidentia, et ea re vitium est; audacia non contrarium sed oppositum est ac propinquum, et tamen vitium est, id. ib. § 165: si fidentia, id est firma animi confisio, scientia quaedam est et opinio gravis non temere assentientis, metus quoque est diffidentia exspectati et impendentis mali, id. Tusc. 4, 37, 80.
2. Fīdentĭa, ae, f., a small town in Gallia Cisalpina, between Parma and Placentia, now Borgo S. Donnino, Vell. 2, 28; Liv. Epit. 88. Its inhabitants are called Fīdentīni, Plin. 3, 15, 20, § 116; Mart. 1, 54.