Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
in-dūro, āvi, ātum, 1, v. a. and n., to make hard, to harden (poet. and post-Aug.). 
- I.  Act. 
 
- A.  Lit.: nivem Indurat Boreas, Ov. Tr. 3, 9, 14: sues indurantes attritu arborum costas, Plin. 8, 52, 78, § 212.
 
- B.  Trop., to harden, steel: indurandus est animus, Sen. Ep. 51: adversus omnia, quae accidere possunt, id. ib. 4: frontem, to render shameless, id. Ben. 7, 28.
 
- II.  Neutr., to become hard, harden: quae (creta) si induraverit, Veg. 3, 82, 2.
Hence, indūrā-tus, a, um, P. a., hardened.  
- A.  Lit.: robora indurata flammis, Stat. Th. 4, 64.
 
- B.  Trop.: induratus praeter spem resistendo hostium timor, Liv. 30, 18, 3: Germanis quid induratius ad omnem patientiam? Sen. Ira, 1, 11.