Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
frondĕus, a, um, adj. [1. frons], of leaves, covered with leaves, leafy: nemora, Verg. A. 1, 191: Romulus frondea (corona) coronavit Hostilium, Plin. 16, 4, 5, § 11: tecta, leafy coverts, poet. for trees in full leaf, Verg. G. 4, 61: casa, covered with leaves, embowered, Ov. F. 3, 528: cuspis, a toothpick cut from a twig, Mart. 14, 22.