Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
tĕnellŭlus, a, um, adj. dim. [tenellus], somewhat tender or delicate (perh. only in the two following passages): puella tenellulo delicatior haedo, Cat. 17, 15: manu lascivulā et tenellulā, Laev. ap. Prisc. p. 903 P.