Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
tĕnellus, a, um, adj. dim. [tener], somewhat tender or delicate (very rare): bella et tenella Casina, Plaut. Cas. 1, 20: vates, Domit. Mart. poët. ap. Suet. Gram. 16: ungulae pullorum equinorum, Varr. R. R. 2, 7, 11: vultus, Stat. S. 5, 5, 86: tenellum enim cito facit putre (aqua), Varr. R. R. 1, 41, 2.